Yes and no. The Toronto pitcher didn't hit Posada, but he definitely was looking for a confrontation. There was no reason for him to be near home plate on the FIRST base side. If he was trying to stop a run from scoring, then he would have been on the third base side. I think he was looking for Posada.
I agree that Posada should have kept his cool. The last thing they need is an injury or suspension that could screw up their chance at the playoffs! The Toronto pitcher came out looking worse, though!
The good news is that Cervelli is back! I really like him as a backup catcher.
My take on it is that Posada was completely out of line and I agree with umpire Jim Joyce that it was a very cheap shot. Two Blue Jay batters were hit by pitches that would lead one to suspect that they were being buzzed. A purpose pitch had to be anticipated, and sure enough, one sailed by Posada. At that moment the issue was over. That's usually the game's way of resolving things like this.
Posada's elbow while scoring and running to his dugout merely served to inflame a situation that was seemingly put to rest.