I don't disagree with you - You’re basically saying, 'You’re wrong, but I don’t want to

You’re basically saying, 'You’re wrong, but I don’t want to admit it, so I’m going to act like I agree.'

My friend said, 'I don’t disagree with you,' when I told him the movie was terrible.

My boss said, 'I don’t disagree with you,' when I told him the budget was wrong.

My brother said, 'I don’t disagree with you,' after I told him he ate the last pizza slice.