Having to hear
Hey, faggot! as you go to class.
Getting death threats as you leave class.
Having others talk in your presence about how the Holocaust was a good thing because at least the Nazis killed all the homosexuals.
That's what homophobia really means. The painfully amusing thing about this is I'm not homosexual; certain people in my high school merely thought I was, and I went to a good high school in many ways. I can't imagine what it would have been like if I was actually gay or at a school where fighting wouldn't be punished by expulsion. Certain lesbian friends of mine would have been disowned by their Catholic families if their parents knew the truth. There's a reason why a large portion of teenage suicides are homosexuals.
Yes, some asshole fanatic gay activists bandy this term around far too much; they're idiots. Deal with it. It's name calling. But last time I looked heterosexuals weren't having their heads smashed in by angry gays who disapproved of breeders. Gay murderers of heterosexuals never got off because they claimed Twinkies unbalanced their blood chemistry. Switch the sexualities of the examples and there is homophobia, plain and simple.