If you are going to say that John-morality and Mary-morality are different things, that is effectively conceding that they are subjective.
The focus doesn’t have to be on John and Mary; it can be on the morality we’re referencing via John and Mary. By analogy, we could talk about John’s hometown and Mary’s hometown, without being subjectivists about the cities we are referencing.
The focus doesn’t have to be on John and Mary; it can be on the morality we’re referencing via John and Mary. By analogy, we could talk about John’s hometown and Mary’s hometown, without being subjectivists about the cities we are referencing.
That isn’t analogous, because towns aren;’t epistemic.