I don't disagree with you
A sneaky way of saying you think the other person is a total idiot, but you don’t want to fight.
My coworker said, 'I don’t disagree with you,' after I told him the coffee machine was broken.
My uncle said, 'I don’t disagree with you,' when I told him he lost the game.
My teacher said, 'I don’t disagree with you,' when I told her the homework was impossible.