Why? Earlier you admitted that subjectivists can make moral claims. Are you disagreeing with yourself again?
Of course not.
Im simply stating that when you hold the view that genocide is wrong even if the Nazis thought it was right, then you are saying that there opinion does not matter. You are saying that genocide is not right just because they thought it was, but that it was wrong even if an entire society thought it was right good and acceptable.
when you speak from this view you are saying that opinions don't actually determine what is morally right and what is morally wrong or what is acceptable and what is not acceptable what is moral and what is immoral you're also saying that a society does not determine what is right and what is wrong what is moral or what is immoral.
It is the same exact thing as saying that the earth is round. Individuals do not determine whether or not the earth is round by saying the earth is round nor do they determine that the earth is not round by saying that the earth is not round. Their opinion regarding the shape of the earth simply does not matter or have 1 way or another an effect on the actual shape of the earth. it is the same thing as saying even if an elementary school child thinks that the earth is flat because all they can see when they walk outside is flat land the earth is not flat because the child thinks that it is flat or is of the opinion that is flat. we would say that the child was wrong in saying that the earth was flat because the shape of the earth is not determined by the opinion of the child or the opinion of an adult or the general consensus of a society. we are rational reasonable and right to maintain that the earth is round even if Russia or China thought the earth was not round. likewise we are rational and reasonable to maintain that genocide is wrong even if some societies think the genocide is right or some individuals think that genocide is right or even if Germany, Russia, and China thought that genocide was right it would be wrong because genocide's being wrong is not determined by general consensus of society or an individual's opinion genocide is WRONG OBJECTIVELY.
When a judge sentences a child molester to prison and tells the molester that molesting children is wrong, the child molester can say: " well your honor, that's your opinion" all he wants to. the judge is basing his sentence on the view that child molestation is objectively wrong.
Now, if you are having trouble understanding this, that is not a good argument for moral relativism. Nor is it a good argument against moral objectivism. It is simply evidence that you are having a hard time understanding simple philosophical precepts and definitions.
The two truth bearers: "genocide is objectively wrong" and "the earth is round" are true in virtue of their correspondence to an actual state of affairs that obtain in the real world, not a person's opinion.
What exactly is so hard for you to understand about this?