There have definitely been efforts made to bring more attention to in-universe prejudices, but I've found that a lot of attempts will result in players OOCly reacting negatively to what the character is saying. They'll get tetchy about it on plurk or in their narration, but their characters won't act on it at all. And as has been mentioned, it's a play-style thing if somebody just doesn't want negative CR and that's worth respecting, but it's such a bummer when you're trying to create it in a friendly OOC atmosphere but no one will react to it ICly.

This isn't an enormous widespread problem that I've noticed, but it is a thing with a few people that play characters whose hands I wish would get a little dirtier. I don't think less of them as players, I just love when the gloves come off in RP and wish people felt more secure doing that.