My boyfriend hates gay guys, is that really homophobic?

Im 19 and my boyfriend is 20. He doesn't understand how gay guys can stand each other. He thinks they're disgusting. He has done "stuff" with a guy before, he got a bj from a guy and he gave the guy a rimjob but that's ok because he said he wore protection on his mouth whe he gave the guy a rimjob. I would never touch him if he didn't. I wouldn't want to be with a guy that a gay guy has touched. He hates gay guys though so I don't have to worry about that. What do you think? Why do people think he's homophobic?