I think its racist. If you hold the belief for the group it means it can subconciously affect your beliefs about the individual in the group. i.e., prejudice.
To clarify, you believe I'm subconsciously believing certain individual black women are taller than they are in reality?
If I could persuade you that I were accurately measuring every woman's height (perhaps by making observations like "she's up to my shoulder" or "she's up to my jaw"), would you be convinced I am not racist?
If I could persuade you that I were accurately measuring every woman's height (perhaps by making observations like "she's up to my shoulder" or "she's up to my jaw"), would you be convinced I am not racist?