Even worse is the self-degrading practice of calling each other "******" which has been adopted by some, mainly young, black people. I refer to myself as "black" rather than "African-American", which is probably at this point a bit old-fashioned, but it's utterly beyond me why anyone would voluntarily use a racial slur to refer to him/herself. I don't think I have ever heard members of any other ethnic group do so, and I hate to hear black people talk this way.
I have heard similar from some young women, who call each other by disgusting terms for women. Something about reclaiming the terms for themselves. I don't get it either.