Yeah. All the time. I work with a bunch of homophobic Marines who I know would go ballistic if they found out I was bisexual. And they talk about it and how it is against God and the Bible and everything and I just say nothing or claim not to know the bible, because I don't being an atheist.
There are lots of other things I say nothing about. Facebook friends who talk constantly about politics and government is evil theories and a constant barrage of save all the damned pets. I always want to say something, but I don't because if I did I would be obligated to talk to them about it.
I don't like to start trout because I would feel obligated to finish it and people are dumb. If you don't believe me check out Shlup's thread about gay racism hate in EoEO.