I was going to say something like that. There is the "achievement gap" that starts in elementary school. First, the teachers are mostly white, and they are subject to being called racist if they try to maintain order in the classroom. From the point at which teachers cannot compel behavior, education suffers. White kids usually don't accuse their teachers of being racist, so they end up more likely to have high school diplomas and basic literacy skills. It may be the fault of the schools for being scared of being called racist, but there are really only a few things that are considered evil by liberals, and they include racism and hypocrisy. Since most teachers are liberal, it would stand to reason that they wouldn't want to be labeled as racist amongst their immediate peers.
I’ve been accused of being racist many times by parents - I simply say, “My wife is not white, my brother in law is black.”
They shut up reaaaaal quick.