Guys have been plunked for a lot less. You know, staring too long at a pitcher, dropping the bat the wrong way after crushing a HR, looking at a HR too long, trotting around the bases too slow (or too fast)....
IMO those things are meant to show a pitcher up. When you stare him down it is a challenge to that pitcher. When you flip your bat exuberantly you're saying I got the best of you. Wen you smile it means you're having fun. It isn't directed directly at the pitcher like these other things are.
Who knows maybe he will get plunked this week but I doubt it.