My dad is racist and I've found the best thing to do is to just ignore those kinds of comments. It used to really piss me off and we've had a number of huge fights about it but it's the kind of thing most people aren't usually willing to really question about themselves. He's convinced he's right, and this conviction being entirely irrational, nothing anyone can say or do is ever going to change his mind, really. All the fights/arguments served to do was put more unnecessary tension between us because as far as I can tell, he's never going to reconsider his thoughts on the matter, and I don't think most racist people ever do. If you're still checking this thread OP (or for anyone in a similar situation), I really think just ignoring the comments and remembering that this is their stupidity and nothing else, is the best course of action.