nerd teacher [books] quoted The End of Faith by Sam Harris
This may seem like an unscientific and potentially racist thing to say, but it is neither. It is not in the least racist, since it is not at all likely that there are biological reasons for the disparities here, and it is unscientific only because science has not yet addressed the moral sphere in a systematic way.
When a book has to tell you it's not racist because it's saying racist things, that might be a good indicator that it is (in fact) racist.