Why most people in the past were not moral realists (Part 2)

According to Mike Huemer, almost everyone in the past was a moral realist. This comment appeared in a recent online discussion, where Huemer stated the following:

It appears that the overwhelming majority of people throughout history were moral realists

I don’t think Huemer would be able to provide a compelling justification for this claim.

What specific historical information would lead Huemer to make this claim? What considerations does he have in mind when he says it appears that people were moral realists? I’d be curious to know, but unfortunately he does not elaborate.

It doesn’t appear that way to me. What would it look like for people to be moral realists or moral antirealists, in particular? Beyond saying that they believe or disbelieve in the existence of stance-independent moral facts (and I don’t know of anyone besides philosophers who speaks this way), it’s not clear what particular behaviors would indicate that someone is a moral realist or a moral antirealist in particular, …