This is a silly appeal to nature.

But to address the point. There may be base instincts to which we are all subject. But that doesn't mean we should embrace them or proudly wear them as a badge. Violence is entirely natural. And yet most will agree it should not be embraced. Someone proudly declaring themselves as violent will (and should!) be judged harshly. I say the same holds true for racism, whether it is "natural" or not.

Much (all?) of civilisational progress is characterised by moving away from the natural state to a higher strata. The civil part of civilization is entirely unnatural