That's because humans have also seen a lot of human beings with diverse skin tones. If we had only seen anime our whole life it would be much more difficult for

That's because humans have also seen a lot of human beings with diverse skin tones. If we had only seen anime our whole life it would be much more difficult for us to conceive of also. With more compute, we will eventually be able to make bigger models with more knowledge of the world that will also be able to overcome this.