Who is more homophobic, straight men or straight women?
Straight women will be all for gay rights one minute, but I've noticed that a lot of bisexual guys have a harder time dating women because women make a big deal about their sexuality. Gay men don't usually mind dating a bi guy. But straight girls, and even some bi girls have a difficult time dealing with the fact that their boyfriend is bi.
Also, if a straight guy comes off as gay, many straight women will avoid dating him because they don't trust that he honestly likes women.