Play dumb and expose the trans ideology by asking them questions. You can make the TRAs realize themselves how homophobic it really is that way. Although, conversations like that usually ends with them trying to change the topic or shut you up.

I like to do this, too. ESPECIALLY if other people who might be on the fence are around. It is unlikely I'll convince the person I'm talking to of anything, but it's sort of like the equivalent rule of commenting online-- "you're not really debating to convince the person you're debating, but the lurkers."