Without commenting on whether this presentation matches the original metaethics sequence (with which I disagree), this summary argument seems both unsupported and unfalsifiable.
Would this be an accurate summary of what you think is the meta-ethics sequence? I feel that you captured the important bits but I also feel that we disagree on some aspects:
V(Elves, ) = Christmas spirity
V(Pebblesorters, ) = primality
V(Humans, _ ) = morality
If V(Humans, Alice) =/= V(Humans, ) that doesn't make morality subjective, it is rather i...
Unpacking "should" as " morally obligated to" is potentially helpful, so inasmuch as you can give separate accounts of "moral" and "obligatory".
The elves are not moral. Not just because I, and humans like me happen to disagree with them, no, certainly not. The elves aren’t even trying to be moral. They don’t even claim to be moral. They don’t care about morality. They care about “The Christmas Spirit,” which is about eggnog and stuff
That doesn't generalise to the point that non humans have no morality. You have m...
Morality binds and blinds. People derive moral claims from emotional and intuitive notions. It can feel good and moral to do amoral things. Objective morality has to be tied to evidence what really is human wellbeing; not to moral intuitions that are adaptions to the benefit of ones ingroup; or post hoc thought experiments about knowledge.
I'm going to assume you mean what you say and are not just arguing about definitions. In that case:
You would be an apologist for HP Lovecraft's Azathoth, at best, if you lived in his universe. There's no objective criterion you could give to explain why that wouldn't be moral, unless you beg the question and bring in moral criteria to judge a possible 'ground of morality.' Yes, I'm saying Nyarlathotep should follow morality instead of the supposed dictates of his alien god. And that's not a contradiction but a tautology.
While I'm on the subject, Aquinian theology is an ugly vulgarization of Aristotle's, the latter being more naturally linked to HPL's Azathoth or the divine pirates of Pastafarianism.
I'm pretty sure this is not an attempt at discussion, but an attempt to be insulting, so I won't discuss it.