There's 2 types of hypocryts. 1 is the Muslim hypocryt and they are basically all the nominal Muslims (Muslims just by name) who don't practice Islam or they practice very little of it
The other type is the non Muslim who pretends to be a Muslim. This type of hypocryt is obviously kafir and is the worst type of kafir as Allah says they are going to be in the bottom of the fire.
What is the source? Did you just made it up to promote your narrative?
Anyways in Islamic terms Hypocrisy means making an outward display of Islam whilst inwardly concealing kufr. That's why hypocrisy is more dangerous than kufr (disbelief) and the punishment for it is more severe, because it is kufr mixed with Islam and its harmful effects are greater. Hence Allah will put the hypocrites in the lowest level of Hell, as He says (interpretation of the meaning):
Verily, the hypocrites will be in the lowest depth (grade) of the Fire; no helper will you find for them [Quran 4:145]
Now you and I have no way to tell who is a hypocrite because who have no way to look into the hearts of people But Prophet Muhammad (peace be upon him) was told who are the hypocrites by Allah Subhanahu Wa Taala directly. So he has all the evidence to call them Kafir but he did not. It is because Prophet Muhammad (peace be upon him) was sent as a mercy to man kind. Hypocrites in his time would pray in the same mosque and will take part in all activities because they way there is always a chance to reform them and make them good believers. If we call them Kaffir and socially boycott them then there is no way to call them to good.
No the Prophet (saw) never done takfir on hypocryts but he knew who they were and the reason he never done takfir on them is, he'd have to kill them then and this could set a bad example as the kuffar could think that Muslims kill their own kind
Follow his example then. By calling those who say they are Muslim Kaffir we are setting a bad example.
I also want to make this clear that Prophet Muhammad (peace be upon him) did not do so because situation demanded him to keep hypocrites with him because Muslims were a minority. Muslims never needed hypocrites to spread Islam or man power to spread Islam. What Prophet Muhammad (peace be upon him) has done is to show that the biggest mission of our life is to spread Islam. If a person says Kalima then that person inshallah will go to heaven one day even if he/she has not practiced Islam in its true spirit. The examples of this are seen in the life of Prophet Muhammad (peace be upon him).
There is famous incident of a Muslim killing a non-Muslim during a battle, despite the man having recited the Kalima. When Prophet Muhammad found out, he was furious. The Muslim soldier said:
“O Messenger of Allah, that man read the Kalima merely to protect himself from our sword.”
Prophet Muhammad reprimanded him:
“Did you open his heart and look inside it?”
We also see the example of this at the time of conquest of Makkah. Abu Sufyan (ra), his son Amir Muawiya (ra) and his wife Hind (ra) accepted Islam. Now this was the hardest pill for many Muslims to swallow because all their battles were against the pagans of Arabs which were lead Abu Sufyan (ra). He clearly accepted Islam when there was no other option left for him. If Prophet Muhammad (peace be upon him) wanted, he would have killed him but he forgave them all. Many of them accepted Islam only to save themselves but no one ever in the history called them kafir but instead we say razi Allahu aanhum because now they became companions of Prophet Muhammad (peace be upon him). Yazid who was grandson of Abu Sufyan later killed Imam Hussain (ra), but again we don't call them kaffir even when they killed thousands of companions of Prophet (peace be upon him). What we do? We leave the matter of judgement in the hands of Allah Subhanahu Wa Taala. Trust be that's the safest approach.
As long as anyone calls him/herself a Muslim whether Shia or Ahmadi, we should not call them Kaffir. That's my understanding of Islam after reading the biography of Prophet Muhammad (peace be upon him) and after reading Muslims history.
Regarding Fundamental beliefs of Islam I agree that if someone rejects the prophethood of Muhammad (peace be upon him) then they commit Kufir. All Muslims know and believe this, so if someone still does that then let it remain between that person and Allah Subhanahu Wa Taala. We can only engage with these people in a peaceful way to convince them through Quran and Sunnah. If they reform then that's good for them. If they don't, then they know what Quran has told us about these people. We don't control their decision and we don't push them to accept our narrative by socially boycotting them.
I agree that if someone associate anyone with Allah then that's shirk and we should all try to avoid it. If someone in Muslims does this (many Berelvies who are Hanafi and shias do this) then again all we can do is show them how that's shirk and hopefully if there is any good left in them they will listen and change.
Regarding abusing Aisha (ra) and companions of prophet Muhammad (peace be upon him), it is a great sin but I don't think anyone will be outside the fold of Islam for this reason. There is no proof of this from Quran and Sunnah. In fact many companions abused each other and many fought against each other and killed each other. So if we make that a rule then many companions will be outside the fold of Islam (naozubillah). I am sorry to say that I have to use these as example but perhaps this will help you to see why this rule has no basis.
Regarding Quran, it is fundamental belief of Muslims to believe in all books. We also know that it is Allah who has taken the responsibility to preserve Quran. When you say Shias read different Quran, it is false and in fact you are saying that Allah Subhanahu Wa Taala has failed to preserve Quran (Naouzubillah). Go to any shia mosque and you will find there Quran is exactly the same as ours. Now the scholars who make this issue actually take very weak hadiths from shia books and say that there hadiths say that verses in Quran are lost. Ask any shia scholar and they will tell you that these hadith narration are weak and accepted as weak by all shias. On the contrary we have sahih hadith which say that there are some verses in Quran which are lost ( if a layman reads those hadiths). These are sahih hadiths in Bukhari and Muslim, so who is question Quran? Shia or Sunni? In fact none is questioning the authenticity of Quran. Shia and Sunni read and believe in same Quran. Understand these basic differences and work to bridge the gaps to unite the ummah instead of dividing them. Our #1 problem is blindly following madhabs. A sunni scholar goes to sunni madrassa and they brain wash them to tell the things about shias which are not the facts. Same is true for shias. Their hate for each other increases. No one is willing to sit together and listen to each other and see if there is any basis for these differences. In reality there is no basis and most of the issues can be resolved if we show tolerance and give respect to each other. We have lot more in common, biggest thing is that they believe in Allah as we do and they believe in Prophet Muhammad (peace be upon him) as we do. Yes there are many bad things which shias do such as muta marriage, matam-e-husain etc. but we also have to see how many bad things Sunnis are doing and have invented into the religion. Anyways my point is that it is better to focus on what's common to bring ummah together.
I don't do takfir brother but if a person is trying to deceive other Muslims and make them go astray by pretending he is Muslim then I will share my suspicions to make them aware, but unless I'm 100 percent sure of someone's kufr I never do takfir. About the shia, I already said that we don't do blanket takfir.... Only if we come to know for certainly that a certain shia holds kufr beliefs such as Quran is corrupted etc then we can do takfir on him but otherwise not, because all shias do not have those beliefs
Its good to know that you don't do Takfir. That's the right Allah Subhanahu Wa Taala did not even gave to Prophet Muhammad peace be upon him. Remember there is no compulsion in religion. Our job is just to convey the message.