It is about culture, which is a real thing.

Racism would mean there are races in humankind, which is mostly found to be untrue.

The implication of what you're saying is that there is no such thing as racism...

Out of curiosity, what would you label people that believe their skin color or ethnic group is superior and that others are inferior? Can you back up your claim that there are no races in humankind?

You are absolutely wrong. I have been a victim and a perpetrator of African time.