Everybody is racist

This isn't really true at all.

Everyone has in-group out-group bias because that's how we evolved, to differentiate between people who are in your group who may be incompetent, to differentiate between people who cooperate and people who don't, to differentiate between people who would lose out if they killed or stole from you vs those who would lose.

But in the environment humans evolved in they lacked the technology to travel far enough to ever meet anyone of a substantially different race.