Reddit reviews Morality: An Introduction to Ethics (Canto Classics)
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Used Book in Good Condition
It's the third chapter of his book Morality: An Introduction to Ethics, called 'Interlude: Relativism'. It's frequently anthologised on its own, as a classic reading against (most forms of) relativism. I think the four chapter sequence that book starts with is the best discussion of subjectivism in ethics you'll find anywhere. The book as a whole is fantastic (and very short, which helps), but it is notorious for becoming more difficult the further you get in it, and at a pretty rapid pace as well.
If you are looking for something scholarly on subject, I recommend Bernard William's book Morality.
Here's a thread I created 4 years ago asking about this topic.
The arguments against Moral relativism are pretty decisive. (There's a difference between subjectivism and relativism, but often people mean the latter during discussion). I recommend looking at this reply here
If you are looking for a clear decisive argument against the theistic view on morality, better off sticking with the Euthyphro dilemma.
Moral judgments are usually distinguished by their binary and normative characteristics, so "good" does not necessarily indicate a moral judgment, as "good" does not necessarily indicate a mandate. A good (in a non-moral sense!) test of whether the word "good" is being used in a moral sense is whether it is being parameterized by a condition of interest. If there is no parameterizing interest, and there is no implied objective (like the two times I've marked my own usages of the word "good" in this comment), then it is most likely a general claim and a normative, that is, a moral expression; otherwise, it's still a judgment, but not necessarily a moral judgment. Your reasoning implies that nonmoral judgments do not exist.
The Wiki article on Value Theory has a good (in a non-moral sense!) run up to the necessity of nonmoral judgments and "goods." Bernard Williams' classic Introduction to Ethics serves as both a fair introduction to much of Ethics in general, and as a perspective well-steeped in moral nihilism itself.