What I believe his beef is that possibly you have made some comments about Asians before (you have used the words "chinks' and 'gooks', the former just last week), and that you are married to a black woamn...
He doesn't like blacks, specifically Nigerians, due to the Nigerians being "Nigerians", ie, scamming mofos and the system...be mad at those who allow them to get away with it...
To me, if a person hate blacks, Mexicans, Asian, whites, whatever, that is how they feel, and they have a narrowview point...
I think it is wrong for him to speak about your wife the way he does, but he is trying to elicit a response, which he has...your original post...I actually believe this needs to handled off of the boards, thru pm's or email, don't get a board involved in a "beef", having those people choose sides, because ther are three sides to everything, yours mine and the truth...who knows things could have said in a pm that pissed him off.