How to make someone less homophobic without revealing that you're gay?

I'm not out the closet yet, and i have a sort of homophobic brother. He says that he doesn't hate gay people, but everything that he says about homosexuality is negative. There's not a religious aspect to it. I think it's just a personal thing to it. I get frustrated with him when talking about gay shit, but I don't lash out at him, because I don't want to seem gay.