Yes, this is true. And this isn't racism. I'll say what I said to the two other people who contested this claim, read the link that accompanies the line. I put it there for a reason. Racism was consciously invented as a way to justify keeping slaves.

Bias, or ingroup preference as you say, is a completely natural part of being a human being. We have it for height and left-handedness and nationality and hair colour and all kinds of things that don't (usually) lead to hatred and certainly not legalised oppression of that group.

To take the example of left-handedness, there was a time when being left-handed carried a significant stigma which today it doesn't. People were killed for being left-handed! But we grew out of it. To pretend that we can't by equating us with primates is bizarre.

We are not chimps (at least most of us aren't). What separates us from animals is the ability to use our higher order thinking to examine our behaviour. Bias? Sure, we'll never completely eliminate that, nor do we need to. But racism? Bigotry and hatred? No. These are learned. Ask any three year old if they hate black people or Jews or foreigners.