I had to look ‘teapot’ up. In my 70+ years, I’d never heard it used as a reference to a homosexual man, let alone as a derogatory term for such a person. Having said that, I don’t use any sort of derogatory terms with regard to LGBTQ+ people - I have respect for them as fellow-humans, self-respect, and standards below which I refuse to allow myself to sink.

Probably an indication of the sewers the kind of people who use those kinds of terms inhabit, and which I stay well clear of.