"Getting back to that whole "cream of the crop" thing."
But the fact that they are black suggests that your institutional bias against black people is incorrect.
To me, it's more a matter of class. My kids have always had black friends, but they were the children from the same areas and the same backgrounds. My oldest daughter is now in a middle school that is fed by lower-class neighborhoods. And unfortunately, she's becoming less and less trusting of black people in general. Because they don't act like her and her friends do.
She's in all the honors classes, so to a large degree she's shielded from the --------. But now when she has a problem with another student, it's usually someone outside of her honors classes, and she makes it a point to mention that they were African American. Two years ago I don't think she would have consciously made the distinction.