Playing devil's advocate is NOT trolling. Someone has to be wrong to have a discussion.
I know what it is. Unfortunatly, you aren't arguing the side of Moral Relativism. You - or, well, freelancer - are arguing that there are no absolute moral truths, which isn't a claim Moral Relativism makes. It says instead that noone is evil, which is perfectly true. By a certain definition, evil is doing 'bad' things for the sake of being 'bad'. Everyone justifies their own actions, even the most 'evil' of people. Hitler really thought it was all the Jews fault; he justified his actions - to himself. But that didn't make the holocaust 'good'. He still thought murder was wrong; he just found a
reason to commit it. There are certain rules that every society has. Do not murder, do not steal, do not lie. No man breaks these rules just to break them; he always find a reason. He always justifies it to himself.
The article you linked explains quite well where this discussion went wrong. I'll quote it for you.
To put it simply; if you believed what you touted, you wouldn't be calling us wrong.