Well, I got what you were saying. I'm just pointing out that that's the roadblock moral relativism runs into, because an absolutist is entitled to his views on morality, and further entitled to believe he can project those standards in his opinions on other people. You may think he's wrong, but in order to be philosophically consistent, your point of view can't hold any more validity than his. Saying there absolutely is no moral truth is just as absolute a statement as saying the moral truth is whatever the bible says, or whatever. It's a little too meta for this thread, and I don't think I'll be venturing into SMP, so I'll just leave it off there.
Another roadblock is, as CSC seems to be pointing out, there probably hasn't been a true moral relativist in the history of the world, because it's just too impractical for the world we live in.