It only sounds like arrogance because we're so used to robotic answers from players with no personality. I have no problem with a guy speaking his mind, he has a right to be frustrated and disgusted with the hockey old boys club after the way he was handled in the OHL - did you see that play that got him a 20+ game suspension? with no history of discipline? Wouldn't have even been looked at if it was some kid from a more traditional (=white) background.
Nobody debates that this kid has first round talent, the talent of a top line player in the NHL. His personality is going to evolve over time, I was pretty angry myself at 18... I mean I still am pretty angry, but I've seen other people change over time.