Could be a combination of competitiveness and lack of maturity. Still not overly concerned, unless it becomes an ongoing thing. Haven't seen anything beyond what lots of players express towards the refs at every single game.Very critical of refs with speech laced with profanities at least twice so far at the tourney (shown on TV). A bit arrogant/cocky in comments.
Funny thing, totally unknown to me when I gave my thoughts, I found this link this morning:
Martin St-Louis n’aime pas l’attitude de Juraj Slafkovsky au championnat du monde
Juraj Slafkovsky est devenu une vraie bête de cirque au championnat du monde.hockey30.com
Might be unreliable clickbait, though, so again I stress that I made my comments independently.