I m more interested on why (mostly straight) people today are so concerned about how others perceive their sexuality , i.e. the "no homo" appendix, both in the real world and online. In none of the stories presented was the sexuality of the participants stated or written. I presume it's because they actually didn't care, or didnt consider it noteworthy.
Because people who are (perceived as) gay are targets of discrimination and violence.
Also if the opposite sex thinks you're gay but you're straight, it's harder to attract them.
That's not strictly the case although it does complicate things somewhat...
As someone with many gay friends, I find your comment totally unhelpful and antagonistic (you are trying to provoke a war but the benefit you seek is unclear. I'm aware of something I call "gay arrogance" that you might be exhibiting).
Most people I know, whether they be homosexual or heterosexual want to make a statement about their sexuality. There are many hang ups in the gay community and as much prejudice as I see in the heterosexual community (breeders anyone??).
To assume that homosexuality gives one some special exemption from hang ups is false. There is no more tolerance (it's just different tolerance).
So, why are almost ALL people hung up about sex? Power, recognition, ego, self-definition.
True story: I've upset gay friends kissing them on the cheek in public because they don't want to look gay - they tell me that I wouldn't understand. I'm very comfortable with my preferences, so it doesn't bother me.