Racism is violent. Not a preference or a missing preference.

No, that's just some retarded shit racists say. People who comprehend the difference between "race" (all humans) and "ethnicity" (different genetic backgrounds) usually don't have a preference for members of their own ethnicity.

> An ethnicity or ethnic group is a group of humans who identify with each other on the basis of perceived shared attributes that distinguish them from other groups. (https://en.wikipedia.org/wiki/Ethnicity) So it ethnicity is based on perceived attributes. No genetic base.