Aumann agreement! Dissension among rational people!

This one's easy; I'm guessing this is about "rational" people (lesswrongers for instance) disagreeing. "Rational" in the above sentence isn't the same as rational as defined in Aumann's paper.

Specifically, we're human beings, two of us don't necessarily have the same priors, or common knowledge of a posterior A for every possible event A. So we're bound to disagree sometimes.