Racist hate by Christians is no more rooted in actual Christianity than the racist hate of the skull shapers is based upon Darwin or Science.
Going back to my broader point, it was meant to explain why science is so reluctant to talk about physiological racial differences or even the entire topic of general intelligence. It's because those theories have a long history of being abused by racists to give their racism some credibility by tying it to science. The idea is that certain ideas end no place good, and I think you'll find some of those same sentiments in the opposition to evolution.