All humans on this planet have been laughing at each other for just being different since the dawn of time. If you're going to take the ludicrous position that it is somehow demeaning for people to either make such jokes or laugh at them, then you need to go ahead and let us know which comedians, comedy shows, or sit-coms that you watch or listen to, that have never used stereotypes, cultural differences, or simply made jokes at the expense of others, to get a few laughs.
Go ahead. I'll wait.