There's a time and a place for seriousness, and a time and a place for joking. I don't expect jokes about race and ethnicity would go over too well during a UN council meeting, for example, but, beyond formal, serious situations, people should just lighten up and learn to laugh at their own idiosyncracies or how silly some of their national customs might look to people who aren't used to them. People should stop getting offended so easily. Otherwise, with political correctness, the whole world just sits around awkardly in a room, hoping that no one coughs, in fear that it might set someone off. Life's too short for that kind of crap.