Actually it’s called gaydar even in the gay community. I know this because I have relatives who are gay.
So, please stop accusing/lecturing others on “rash judgment”. You seem to take great pride in it and have been guilty of it yourself in this very thread.
I do have a weakness for rash judgment and detraction. As I mentioned before (I think), it comes up in Confession regularly. It's a nasty sin, and deeply rooted.