Why do we call people "racist" is there's only 1 human race and a variety of cultures?

Deep

New member
Doesn't "racist" come from the base word "race" and there is only 1 race to describe mankind, isn't there, which is the "human race".
So why is that people call others racist for being offensive or making a rude comment about a culture when there's only 1 race?
 
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