Let me start by saying that I am *not* a fan of PK. I thought a year and a bit ago that he had matured somewhat but he has (IMO) regressed a little. Nevertheless I think he's got his head in the right space most of the time, and what he does with the kids, well, that's more than just great PR -- I think he truly enjoys it (and maybe he enjoys a does of hero-worship, too).
Now, when I first heard what Therrien said my immediate reaction (without having seen the play) was, wow, PK must have really screwed up. He must have done something selfish. But when I saw the play, all I saw was a skilled player trying to carry the puck into the offensive zone and getting held (a little) and tripped-up. There could easily have been a penalty on that play. Now, once PK loses the puck, there are still 4 other skaters out there who do *not* have the puck and are not being held/tripped to the ice.
Anyhow, that's how I see it. Therrien has let the pressure get to him and he lashed out at the only guy on that team who has continued to perform to his usual levels since Price went down. I always thought Therrien lacked class and composure; really could not handle the pressure in a graceful way. This just confirmed it.
Now, all that said, yeah, it was pretty arrogant of PK to say that (in his defense, it was not really a direct quote, but delivered through his agent).