I don't understand what is wrong with tribal jokes as long as they aren't meant to belittle a specific person. In order for a good joke, someone or something has to be at the end of it, and just because people are overly sensitive and have white-guilt doesn't mean that the joke(s) had any bad intentions.
If some black celebrity were to tell a white joke and called some guy cracker no stuffs would be given. That's why we have the Black Entertainment Television and not a white equivalent.
White-Guilt people, get over it.