The discourse about homosexuality in a hetero-normative world has gone on for ages. Homosexuality has reached a certain point of acceptance and most people feel more uncomfortable with the way how some people of the gay/lesbian community point out their preferences than with the preferences themselves.
I myself have no interest in another persons sexual orientation and preferences and practices, as long as anyone involved agrees on whatever (this excludes animals, children and other individuals that are not able to make decisions about their sexual behavior). Why someone who is over his teen years needs to shout out his interests like that is a mystery to me. I don’t mind someone mentioning the gender of his partner, I’m talking about that kind of people who introduce themselves with words like “Hi I’m gay”.
“Hi Gay, I’m Not-Giving-A-Fuck” is from my point of view a totally appropriate answer to that.