If you’d like to read up on the epistemology of moral disagreement, you can have a look at:
Adam Elga, ‘Reflection and Disagreement’
Tom Kelly, “Peer Disagreement and Higher-Order Evidence”
Those two articles set the stage for the following article by Kieran Setiya:
Kieran Setiya, “Does Moral Theory Corrupt Youth?”
In addition, keep your eye open for his forthcoming monograph: Kieran Setiya, Knowing Right From Wrong
Matt Teichman