Celebrim
Legend
In 1E?This is part of your confusion I think.
He keeps insisting on saying things like AC 5 is higher than AC 0 even after I quoted the DMG showing it using the normal, natural, correct way of talking about 1e AC. And he keeps correcting people for using the terminology that AC 5 is below AC 0 that is right there in the DMG even after I showed him its in the DMG.
It's not that he's confused about AC 5 being better than AC 0 - he understands it's actually worse. It's not even that he is confused about your understanding of the game or my understanding of the game. He knows that I know how it works, and he knows now - because I've quoted the book - that I had it right all along.
So, there is no use following up on this.