Not all Africans have black skin. A lot of them have brown skin.
http://abd.disney.go.com/abd/en_US/destination?name=SouthAfricaLandingPage
The last picture here shows they are more "like us" outside of the U.S., more European, like they could lose their tan and be somebody who's not considered black.
People tend to get upset when I think like oh we should be nicer to people. I don't know why blacks here are so blatant and upset deciding between liking being black or wanting to be something else.