Going through the Metaethics sequence looking for nitpicks. The Morality-as-Preferences ones aren't that hard with the philosophy of mind theory that by default people have the delusion that Right and Wrong actually exist. Although the concept of Right and Wrong without clarification is incoherent, this doesn't stop people referring to them anyway.

As a result, they refer to things being Right or Wrong, are persuaded about notions of Right or Wrong based on their own understanding, and sometimes violate their own notions.