I respect you a great deal and that's why I'm disappointed in this comment. It's not only because it's uncharacteristically obtuse, but because it smacks of a disturbing syndrome I've seen in some fellow black people who've "made it."
In situations where race comes up, people with this issue go out of their way to let their non-black peers know that they are not interested in discussing race ... unlike all those other blacks they may have heard about. It's no different from a woman trying to fit in with male colleagues by going out of her way to slam any female colleague who files a sexual harassment complaint. It's sad, unnecessary, and adds nothing substantive to the discussion. Let's not look down our noses at other people to make ourselves looks bigger.
The question of whether a black person has ever been picked for YCombinator is interesting and at the very least certainly shouldn't be verboten.