If you know the answer to that one, then you're on my team.
On a mildly serious note - I rarely judge anyone's intelligence to begin with, so I certainly never would based on race or culture. But as a 5'2" white female I learned young to always have the big dudes on your side, and yes - I have a tendency to assume that black dudes are going to be big dudes. Therefore, I definitely want you on my team for dodgeball (cause I'm shamelessly expecting you're big enough so that I wouldn't want you on the other team), and now that I've read your posts I know I want you on my pub quiz team. Er, quizbowl team. Wait, no - definitely pub quiz. You haven't confirmed quizbowl includes beer, so I'm going to have to go with a known generalization.
Is that prejudice?