My answer/belief to this question is that men want to come across as masculine and they believe that if they approve of homosexuals that they will be seen as feminine or a homosexual themselves. When I was reading the textbook I found it interesting when I came across a research study that was done. They had two group of heterosexual males except one group was homophobic while the other was not. They placed a video of male on male action and recorded the sexual response. The heterosexual males who were not homophobic had no sexual response to the video but the heterosexual males who were homophobic had a small sexual response to the video. So with this said it also makes me wonder if most homophobic males are gay themselves or unsure of their sexual orientation.
homophobic cartoon I found on Google