History is no longer really taught in western schools. At least, not in the anglosphere. Can't say about Europe. We're lucky if Canadian/American kids learn much about our own history, much less the rest of the world. You hear these supposedly educated people talk about the depredations of Europeans on the rest of the world as if this was in any way unique. The history of the world is that of whoever was stronger preying on whoever was weaker. Few people have much awareness of the Muslim attacks on India, and the incredible slaughter which took place there, nor of the internal fighting in China, or what Japan did to Korea, or what other parts of the world did to each other. All they know is Europeans (whites) conquered and were mean to people. They don't have a contest within which to place that behavior so they compare it to how they think people ought to act based upon today's values.
Ie, everyone knows about the slave trade from western Africa to the US but almost no one knows about the thousand year slave trade from Eastern Africa to Egypt and the Arab world. So when you talk about slavery, most people think of the old US south.