Not just some guys are homophobic--some women are too. The meaning of homophobia is simply that the person is straight and afraid or intimidated by someone who is gay...especially women are homophobic are about women and men are homophobic about men. The homophobics are afraid the gay person will "hit on them" or "touch them" or whatever, and they probably think that is disgusting.
I am not homophobic. I am a woman who is straight and haven't gone "looking for gay friends", as someone posted somewhere in this thread, but I have met women that are gay, and outside of friendship, there was nothing they expected from me. I wasn't/am not disgusted or afraid of them. However, if a gay woman who was my friend "hit on me" or expressed her physical attraction to me, I would make that known to her, and I would end the friendship since when you are physically attracted to someone it doesn't just go away so it would be too big of an issue for us to be around each other.
A male member of my family is gay, and his partner and he are two of the nicest guys you would ever want to meet. My family and the other guy's family accepted their relationship immediately. However, when other people (like at family and friends parties) know about it, some people, mostly guys that are homophobic, avoid them like the plague.
I believe what I have read...that gay people are born that way. It is not a choice they make, and whether to be open about it is their business. If someone is homophobic then it is there choice to avoid talking to or being around gays.
They are just people with different sexual preferences than straight people. They don't have to be accepted by anyone, but if somone is mean to them or makes fun of them, IT IS DEAD WRONG!