By most accepted definitions, racism is the belief that one or more race is inherently better or worse in some regard.
What if that belief were true? Would it still be racist?
Concretely (since a reply brings up biology): I believe African women are "better" (taller, have larger asses, and less body hair) than White/Asian women. I believe these differences are primarily biological, likely genetic, in origin.
I do discriminate on the basis of traits correlated with race - I am more attracted to tall, dark women with larger asses. I've dated more women from Africa in the past 6 months than from any other continent.
Am I racist?
(Note: I'm not African, nor will I be offended if you call me racist, so don't hold back. I'm simply attempting to understand the viewpoint expressed.)