And so my options are either to overpower them (by not letting them achieve their idea of good when it conflicts with mine) or trade with them.
There’s room for persuasion and deliberation as well. Moral anti-realists can care about how other people form moral beliefs (e.g. quality of justifications, coherence of values, non-coercion).
Generally agree, but disagree with this part:
There’s room for persuasion and deliberation as well. Moral anti-realists can care about how other people form moral beliefs (e.g. quality of justifications, coherence of values, non-coercion).
I think those things can be generally interpreted as “trades” in the broadest sense. Sometimes trades of favour, reputation, or knowledge.