I read most of this in a newspaper, the rest I've heard from radio commentators.
So apparently Andy wasn't in his finest mood during his week in Montreal and he made sure that everyone noticed it. Here's some highlights :
After his loss to Djokovic in the quarters, he smashed his racquet so hard against the lockerroom wall that it went into the wall and Andy couldn't take it out.
He apparently repeatedly told some tournament volunteers to "Speak White" when they had trouble speaking English, saying that "This is North America, speak English". Smart and most definitely culturally aware... (NOT CONFIRMED)... hearsay.
He also spit on a linesperson water bottle after losing a point during one of his matches.
He suddenly left an autograph session for kids, complaining about the fact that he "couldn't understand what they were saying".