Typical wingnut. Either doesn't understand what most people mean by "diversity" or is deliberately misusing it to deceive.
Sowell is usually wrong, but not dumb. So my guess is he's deliberately being a jerk.
And look at all our HROT folks jumping at the chance to pile on. Some of them, no doubt, think this proves they aren't racists because - look here! - they're agreeing with a black man!