I really think it is simple. You are attracted to them if you were close to them and knew them before and you are not attracted to them easily if you did not know them. Ever had that feeling you've known someone your whole life even though you just met?
I'm gonna stick to the word "vibe" instead of aura here, because it is easier to relate to (I think so anyway). When you get a good or bad vibe from somebody, it can just be your perception. I'm not a very social person and I get bad vibes from most people. Is it the people or is it me? LOL. I say the latter.
More often than not I look down or away and keep with my business. I don't go out of my way to be super inviting or talkative, but when I am approached for whatever reason I'm friendly and smile

Most would probably get a bad vibe if they come near me because I wear hijab and I don't smile much. I'm a nice lady though lol. So it would be their perception of me
We often (i am NOT pointing at you but in general) analyze things from the perspective of our knowledge. So whatever does not meet OUR standards, we brand it as non-existent. However just recently i have discovered this method of finding the method of DISPROVING with all our heart our own opinion and knowledge BUT with all honesty. Then if you have found no logical argument against your own opinion one can brand it to be the truth. While we majority of times try to find 1000 reasons why our opinion is valid which we all can off course find those 1000 reasons, but finding arguments against your opinion makes it much better learning experience and making you more humble towards people in general. Sub'han'Allah, it wasn't even my own discovery i argue. I typed it but i learned from my own comment

!!?? This since i have become Muslim by choice has happened often to me (learning from my own words). As i know how dumb and ignorant i am and the things that i say i acknowledge are NOT from me, the ONLY things that i do acknowledge are from me are the rubbish-comments and make no sense comments. btw, don't think that i brand myself a "special" person, from the honesty perspective i brand myself rather an ignorant idiot who questions things than any of the positive branding. Anyhow, to apply this method is getting all the information a person says or has about something.
Brother @
ardianto mentioned these things earlier
Face is reflective of the heart. If someone is friendly and kind hearted, then his/her friendliness and kindness will be reflected on the face, and people will have good impression on him/her. But if someone is arrogant, then his/her arrogance will be reflected on the face, and people will have bad impression on him/her.
I am not talking about face expression that can be changed anytime depend on mood and feeling. But about aura. Friendly people and arrogant people exude different aura on their faces that can affect the feeling of people who see them. That's why if we want to be loved by the others we must eliminate the arrogance from our heart.
Nonsense?. Just try, my brother. Just try. Throw away arrogance from your heart. In Shaa Allah, you will be surprised when you see many people smile at you although you don't know them.
I agree 100% with how he tries to define what i am trying to say, all though i think just like him we are not sure what kind of words we should use. As he used "aura"..well aura by majority is defined as something that covers the whole body. While our argument is something that emanates from the face.
Your argument is trying to fit what we are saying in the category of that hadith. However what we argue is something that is "negative" that emanates from the face, while souls before entering this life had no such a thing a negativity as far as i know (do please correct me if i am wrong). As when a soul is born it is pure and good. Later on it becomes impure you could say as it is being corrupted with illogical and negative idea's.
Later on in your comment you refer to the "vibe"-feeling, but still as in my previous comment to brother @
Serinity (comment #27) i tried to clarify this "vibe"-feeling being totally something else than what i am trying to describe.
So the end question for you is, COULD it be that this Simple_Person is describing something else than what i have experienced in my life? If yes..well nothing could be said as you have not experienced it yourself before or maybe have but forgotten about it.
If no, another question is, have you experienced all the things in life a human being could somehow have experienced to be able to say such a thing does not exist? As for example, we as Muslims acknowledge something as imaan. The Muslim who has NEVER tasted imaan will NEVER understand what it is..only by definition made by other people. The moment you taste imaan is as if you have uncovered a new dimension. Suddenly nothing in this life is of importance when you are in that state. Which is a very odd thing to be saying for a Muslim who has never tasted imaan. He/she will NEVER understands how it could be that person X who has tasted imaan suddenly doesn't value money, material gain or whatever. As if person X can imagine life without time. Why i use this example is because for us human beings trying to imagine things without time is I ARGUE impossible in our current physiological state. We cannot comprehend ...no time..
Please forgive me for making it a bit complicated as i try often to keep things simple.