This kind of pop-sociobiology often tries to present humans as werewolves, as superficially intelligent beings who are, in fact, driven and guided by deep animalistic rage. It's true that being human can be confusing, and sometimes you don't feel in control of yourself, but that's not because of your brutish tribal instinct, it's because you are a complex, social, emotional being with a lifetimes worth of learned information. Whether it feels that way or not, you can entirely control whether you are racist, or whether you are violent, and if you (hypothetical you here) are these things, it is likely because you have weighed up the situation and decided that it benefits you in some way, even if that process wasn't conscious. That's what humans do, they learn and adapt. It's their most distinctive evolutionary feature by far.