Come on, really?
Every time I enter the game, I say "sup niggaz", it is almost customary in NA. Also, the 2nd guy was obviously joking.
The "no racism" rule should be enforced only when there is actual racism and malevolent behaviour. Random fucking around and joking behaviour shouldn't be punished (unless it is malevolent, of course). The mods aren't here to be your thought police. As I said a few times back, if you don't like it, ignore him.