If you disagree on point two, please tell us what color you think they are if not black. Also explain why point one is acceptable to you and point two is not, without contradicting yourself. Thanks.
Okay, a few points [note: I'm not any of the ACs here, I'm a Pseudonymous Coward instead ;)].
Firstly, I have heard the word 'nigger' used to refer to white/brown/black/yellow/blue people (yeah, those smurfs on welfare!).
nigga, niggah etc. al.(noun)1.describes an ignorant, uneducated, foolish individual regardless of race, color, religion, sexual orientation, etc.
2. endearing term between two or more individual to describe a friendship or bond.
1. Shut up, you nigger
2. Chris, you my nigga. - Urban Dictionary (definition #4)
Secondly, most people who call themselves 'black' are brown. Yes, BROWN. As in, what you get if you use the HTML color code 'brown' (produces #802A2A). I have met many brown people but only several people who were truly black - and they were Sudanese, not 'African-American' - which is also a BS term ("Oh, you have dual citizenship? May I see your passport?") - but I'll stop that rant right there.
Third, his statement was posed in the form of "A is B", and seemingly you took it upon yourself to extrapolate "All B's are A" from it, which is a logical fallacy. I would personally discount his implication that "All A's are B", but your objection appears to reject the notion that "Some B's are A", which is most definitely a true assertion which makes your outright rejection obviously incorrect.
Finally, what the frack does this have to do with online gaming? If I knew there were a bunch of brown-o-phobes in a particular server, I would join up with a decidedly over-tanned avatar just to laugh at their reactions when they get pwned by a pseudonigger. Idiots with ridiculous bigotries are fun to abuse :)