Is my rationale correct here?:
If relativism is relative, relativism is a contradiction in itself, because you’re forced to believe what other people think is morally correct, is correct for them, and since it’s possible that someone (let’s call them person A) can be led to believe that objectivism is always the case in morality, then relativists are forced to believe that objectivism is the case for person A, but if moral objectivism is true for person A, then absolute relativism isn't. In other words, relativism is impossible if there’s someone who believes morality is objective, because if they do, it is correct according to relativists, but if objectivism is correct, then absolute relativism is not.
And if relativism is not relative, and it’s the only objective thing in morality, that means relativism isn’t the case because there would exist something that’s objectively moral: relativism. You can’t force relativism onto everyone, because if you do, you make relativism objective, and if it’s objective, it’s not relative.
Therefore, absolute relativism is impossible and there must be at least one objective moral truth