So a black guy walks in to a KFC. Because he wants chicken. What's wrong with that?
Wow, that's offensive.  Why do you think it's okay to say such things about black people?
I mean c'mon. It's obvious that I can't be racist if I'm black myself.
Even though you are black, it isn't really appropriate to make jokes insinuating that all black people eat at KFC since that is a harmful stereotype. Making jokes like reinforces negative beliefs about black people and normalizes the idea that black people only eat unhealthy food. Instead of making jokes that use race as a punchline, try to find more lighter subjects to joke about so that more people can appreciate your humor.