Every manager is two different people. There is the guy who is winning, and the guy who is not. Sir Alex Ferguson was absolutely charming after a game, as long as he had won. If he hadn't, he was a boiling head of frustration.
I have been there. On many occasions I woke up the next day and was not necessarily proud of how confrontational I had been with the officials or opposition manager.
Mikel Arteta would have felt like that this week, embarrassed by some of his behaviour during Arsenal's goalless draw at home to Newcastle on Tuesday.