Well this is one of the ways in which WOMEN are actually superior to men. Women generally don't feel quite as threatened by homosexual contact as many men do. I've concluded this comes from many things, but a few of them are the fact I believe that women are more secure and comfortable with their sexuality than men are, women are not expected to live up to as rigid of gender codes and rules as men are.
I also have concluded that despite men running the world, men in general (gay or straight) have harder lives than women. No one gives tom boys a hard time or thinks twice if women hold hands, kiss, or toilet together, so therefore two females being together isnt too out of the book for some. Men on the other hand have a strict set of rules to live by, and break one of those codes once and youre a "fag" for life. It's pathetic, but is what it is. Homophobia isnt quite the word i'd use for alot of straight people's hate (especially 'straight' men's).
But the more I think about it there is some genuine fear there in the fact that a "straight" man's biggest fear is being thought of as gay or being hit on by a man. They fear the acts and the thoughts, not actual gay people. Therefore many "straight" men feel the need to declare their straightness and manhood by being anti gay and vocal about it. While not realizing how insecure it makes them look.
If I were "straight" the last thing i'd be worried about was gay people (in a good way or bad) I wouldnt give it a second thought as i'd be too busy worrying about women, and if a man hit on me, id be flattered and would just say not interested. Why waste all that time, energy, and effort on hate? Why not put that energy into something positive and you get some females instead of worrying about fags and thinking how 'gross" they are?
Gays are often just used as a scapegoat too. Many "straight" men have horrible lives, so must feel good to many of them to try to make others feel bad since their lives are shitty. I'd assume "straight" men who actually get pussy and get women wouldnt be as anti gay.