It is impressive that he was able to jump into the stands, get his hands on the ball in an attempt to save it, and then push the coach all in one motion. that would be hard to do even with practice so kudos to him:)
If it was not for his reputation, this would be a non story. Personally I think this move was basically a jerk move. It all happened so fast, I do not think he was purposely pushing an opposing coach. I think it is mostly him pushing someone away merely because he is a jerk.