Flamers are hilarious, to me at least. I love my flamer friends. They're sassy, loud, and their wit could cut throats. They're the perfect people to have back you up in a verbal war with some random annoying girl or douchebag.
Me? It's interesting. I'm just a huge nerd. I love DnD, video games, languages, history, cultural studies, and academic study of religion. In the groups of friends where other gay people are present, these are the traits my friends know me by and to them, my sexuality is unremarkable. In the groups of friends that consist entirely of straight guys (i.e. the overwhelming majority of my friends), I am a token gay guy whose sexuality is tagged as an important part of his identity. My friends all love gay people and utterly despise homophobes, but they kind of slapped a label onto me...but I use it to my advantage for humor.
I guess one thing is this: straight guys talk often about this "I am okay with gay guys as long as it isn't a big part of their identity" attitude.
The thing is, being gay is simply a part of someone's identity and has a huge impact on their life, whether they make a big deal about it or not. Homophobia, I promise you, is still virulent and thriving. If you don't make it a part of your identity, they certainly will the second they catch on. Even liberals, as I mentioned before, might do so in a benign manner, in the same way they possibly would gently tease the single Hispanic kid in the group. I've seen it happen with people of every racial, sexual, and religious group under the sun. I suppose most people just run with it.
Sometimes, even for those who don't care, it gets too much. When I was fifteen, one of my closest friend spent month after month making unrelenting gay jokes that he did not end even after I asked him to tone it down repeatedly. One day, after nearly ten straight hours of that bullshit during DnD, I slapped him right across the face. He was angry, and then felt bad, and then the gay jokes fell to a much, much, much more reasonable level.
My apologies, this post is poorly organized as I have slept little lately, and most of it in class. I understand why flamers or gay people who seem to make a big deal of their sexuality annoy you. I really do. But what I am trying to say is two things: there is a reason why and they are not the only, or even the worst, offenders.