The vast majority of philosophers believed that men were superior to woman and that those of lighter skin were superior to those of darker skin and in general that philosophers were superior to anyone who was not a philosopher. They either didn’t spend time debating this because they all agreed, or in cases where they did, their arguments are not hovered in teaching material because we “want to focus on the pats that are actually true”.
> The vast majority of philosophers believed that (...) those of lighter skin were superior to those of darker skin
Source? We don't know the actual skin tone of Ancient philosophers, but it's likely that Greek and Roman philosophers (many of which were born in and lived in Middle East or Africa) were of darker skin than the Germanic barbarians, whom they considered inferior.