I don't advocate racial hatred towards anyone, however...
If someone calls you names and you beat them up at work, school, the parking lot etc, you could be charged with Assault. Calling someone names really isn't a crime(maybe you could file harassment charges depending on circumstance). You should not be punching people and expect no repercussions legally or otherwise. Even if the guy did say something like that, Dikembe would definitely get sued and lose if he punches a guy for calling him names.