Wa alaikum as'salaam,
They (gays and lesbians) both go against the natural disposition (fitrah) which Allaah has created in mankind – and also in animals – whereby the male is inclined towards the female, and vice versa. Whoever goes against that goes against the natural disposition of mankind, the fitrah.
The crime of homosexuality is one of the greatest of crimes, the worst of sins and the most abhorrent of deeds, and Allaah punished those who did it in a way that He did not punish other nations. Allah talks about this sin and people of Lut r.a. in surah
[al-Hijr 15:72-76]
The Messenger of Allaah (peace and blessings of Allaah be upon him) said: “Whoever you find doing the action of the people of Loot, execute the one who does it and the one to whom it is done.”. Classed as saheeh by al-Albaani in
Saheeh al-Tirmidhi.
more here:
https://islamqa.info/en/38622
So how can one support lgbt community and be friends with them?
I would not befriend them and just tell them my religion does not approve this nor allows us associating with anyone who engages in this sin.
hijab is required against non-mahrams, even gays. See
https://islamqa.info/en/166083
Generally a woman can go without hijab in front of other women, Muslim or other wise. But if it fear that the other women may describe her looks and body to others then it's not allowed to uncover in front of her, be she Muslim or non Muslims. And with lesbians, it's a given fact that she takes interest in a female body like man does so it would not be allowed in front of her either.