When someone says, "That's so gay," but means, "That's so stupid," they're being homophobic. Obviously. But a straight guy who says he's gay for musicals isn't saying he's stupid for them, TCJ, he's saying, "I love something that many gay men are passionate about—and I'm not talking about cock." Not all gay men are passionate about musical theater, of course, just as not all straight men are into football. But a man with a passion for musical theater is likelier to be gay; if not, he'll at least be comfortable around gay people. I've heard gay guys who avidly follow the NFL describe themselves as straight for football. Likewise, a man with a passion for football is likelier to be straight.