I’m with Chaosmancer with this one, but I think that the two sides are using different definitions for “disagreement”.
“Disagreements” are like “I want pasta for supper and my wife wants chili”. This is the equivalent of the rules disagreements referred to in this thread. There is no ultimate authority between my wife and I, but somehow, we manage to agree on what to eat (every single night even!).
I have difficulty envisaging our having a sufficiently serious disagreement that we wouldn’t be able to come to a decision on.