Why do gays get offended when I say that most of them speak with a lisp and its learned to 'recognize other gays.not all gays just a lot.

I'm confused as to why this is offense when it's what I know to be true. I live in Georgia and have met hundreds upon hundreds of gays. I would say three put of fur speak that way at least in a little manner that's not normal. Can someone explain why me saying black people are black is offense lol..example obviously lol