The truth doesn't matter to those people.

Slavery was the norm all over the world up to a couple hundred years ago.

It was practiced all over Africa, the Arab world, and Asia. Most all native American tribes had slaves. In fact when Lincoln outlawed slavery, one of the northwest tribes erected a totum pole that was supposed to curse him for doing so.

The Europeans had less slavery than others around the world and they were often taken as slaves to north Africa.

No one cares about truth or logic though.
I love to lick toilet seats no matter what.