PK needs to get under the opponent's skin. It's just a part of his dna and has been since he came up in 2010. He thrives off the challenge of going against the other team's best, and it's part of what makes him effective.
I'm sure Crosby is accustomed to guys using verbal and physical tactics to try and get him off his game too. If the preds are winning this series 3-2, I bet the narrative changes to pk taking Crosby off his game.
At the end of the day, these are two good players trying to get the best of each other. None of these guys are doing anything they are not known to do, nor are they experiencing any different treatment than usual. Just sit back, enjoy it, and watch it unfold.