Maybe he'd grown a little. Or maybe he was just tired of arguing. It never seemed to get him anywhere, particularly not with Steve. There was plenty to deny - plenty he could argue over since he had been positive that he'd just been trying to do some good, at least at first. He'd been so tired of people getting hurt or dying because of them (because of him). He was still tired.
"We're not a team anymore," Tony pointed out, because he had to. Because -- well. One disagreement and that was what had happened. He rubbed at his temple and glanced down at his glass, thumb rubbing against the rim. "And no. That isn't where the problem is, is it." In the end, when all the bullshit was shoved to the side, the problem between Tony and Steve didn't have anything to do with the Accords. They weren't what still had Tony so angry sometimes that he couldn't even find words, what kept him up well into the night thinking.
"You know what the problem is. Do you really want to talk about it?"