This came as a big surprise to me when I realized it a few months ago, but there was no racism in the classical world.
Think about it. A Greek only cared whether or not you were Greek. If you weren't Greek, he didn't care what color you were. That's chauvinism, but it isn't racism.
If my memory serves me correctly, when Herodotus is talking about the "long-lived Ethiopians," he doesn't even say they ...