When he does this, completely ignore what he says, and maybe talk to the four beautiful kids about music and food and stuff like that.

I'd imagine he probably does it to get a rise out of you. The normal way people deal with these kind of differences is to avoid the subjects which stir things up unpleasantly, as part of normal courtesy.

That doesn't rule out lively discussions, which recognise the differences and explore them. The real trouble is when someone talks as if they assume you share views you detest.