Apparently according to some, you can laugh about anything you like -- EXCEPT stereotypes.I have no problem laughing about people other than me, because (1) I'm sure they laugh about me, and (2) I don't think they are inferior or worse than I am because they are different.
Ultimately the only thing humans laugh about are ... humans. If we laugh at animals it's because they remind us of humans.
If we never said anything that might possibly offend somebody, we'd never say anything. And I hate mime.