See, but that's the thing. You think you're "pissing on me" because you regard being gay as something to ridicule. That's the only way the insult works. And if I thought being gay was offensive, as you at least implicitly do, then I would be offended. But I am not. Let me give you another example. If you said I was black, I wouldn't be offended even though I'm not black. I would merely correct you. But if you were to call, say, ET's Clubber Lang black, he would be very offended because his post history suggests his animus towards people of color.
The upshot here is that you think you are "pissing on me" by calling me gay because of your own animus towards those who are gay. And you are laying bare your obvious preoccupation with orientation, which arguably suggests a conflicted mind. Thanks for playing. Have a great day.