How do you know it was cultural and not genetic? All of these “culture only” people seem to believe what they want and ignore whatever possiblities they don’t like. There is pretty surely both a cultural AND a genetic component. There is NO evidence denying that likelihood.
No doubt whites are the superior race and the others are not really human. Satisfied. I’m tired of this nonsense and finished with such discussions. Kind of like I don’t argue with young earth creationists anymore.