I think we can make fun of ourselves without being mean. Russell Peters (who is half-Indian) jokes about Asian stereotypes. It might not be everyone’s cup of tea, but he isn’t mean-spirited and I find him quite humorous.
One of my favorite comedians is Gabriel Iglesias. He once told a joke about fat guys on a roller coaster, which I found absolutely hilarious. He’s fat himself, and he wasn’t belittling fat people, but he was joking about people of a certain size. I didn’t feel like it was harmful.
I do feel like we have to be able to laugh at ourselves. Also, sometimes taking stereotypes to a ridiculous level does expose just how ridiculous stereotyping people actually is.
That’s just my take on things.