It really depends on the intent behind the joke – mean spirited or bigoted comments are usually very recognizable. Otherwise, I’m just a guilty as the next person for joking about stereotypes. It’s definitely possible to go overboard on the whole whole “PC” thing. We should all be able to laugh at ourselves, right? If I have a problem with something a friend or associate says, I’ll tell them. If they have a problem with that, or continue in the same vein, then that’s not someone that I’m going to hang out with.