It is a game no matter how you put it, a game made up by a black youth. As stated by meathead there are a set of rules, I have several black relatives and they can all concur that one of the rules is to target persons of any race but black, if that's not racist then what is.
Someone being homophobic is their own opinion, this is not relevant to his statement at all. Poster is entitled to their own opinion, being homophobic isn't against any rules or regulations.