I think many of the people responding here have really been treated badly and there is really no excuse for it.
That being said, you are adults and know that homosexuality is not accepted in most places. I think in many cases illustrated here and what I have seen demonstrated, the gay person is eliciting a desired response. Many gays dress provocative, speak in a fake lisp and publicly demonstrate affection. This is called passive aggressive behavior and it is done for attention. Yes the attention is negative, but attention none the less. As Wingnut (above) says above, "fuck pacifism". I think many people are aggressively trying to throw their way of life in the face of as many people as possible.
So there's no excuses for abusing queers in public, and yet you have gone to the trouble of providing some...
Obviously any PDA is to elicit a response. When I see a couple holding hands and giving each other lovey-dovey eyes it's quite beautiful actually, and if I am ever bothered by a public slobbery snog session it's because I am obligated to distance myself from it, when really what part of me would like to do is watch it as a little window in the world of the couple. There is a concept in tantra of a 'third heart' or third soul created when two interact, something which is unique to each pair, and frankly it's not often you get to watch such a secluded species really bloom out in the open, especially when each member of this hybrid species is unique.
But of course manners and personal boundaries obligate us to maintain some distance, which is the taboo that exhibitionists/voyeurs exploit, blah blah blah etc.
Side note, one of my favorite websites is the
Nonverbal Dictionary of Gestures, Signs and Body Language Cues, I recommend it for some fascinating reading.
Also, you need to learn that lisps are not "fake." Oh they're learned, developed, affected at times for humor or meaning... like any other fucking accent! A lisp is not a signal that "you must treat me as Queer Role-Performer X, Super-Outy-Out FAG Of The Rainbow World", it is a sign that the speaker is comfortable enough to let you (as a friend or merely a bystander) hear what her voice
actually sounds like. Would you prefer the role-playing that's dishonest? There's a "fake" straight voice too, we know how to play that shit up.
To flame in public (shocking I know) is no more passive-aggressive than to tell adults "you are adults". Yeah maybe my tone here is annoying you, but guess what, queers get annoyed when the lesser parts of others do the typing.