I mean. I don't think it's a question of offense as much as it's just reductive and an oversimplification of the problem.Why is anyone offended by IF he comes in as a mopey beanpole? Put down your pitchforks.
I've seen it argued multiple times that other kids come into the league and don't throw their head back in frustration like him. And maybe it's not common but he was still a teenager not too long ago.
Yeah Leo has to find coping mechanisms and the strength to persevere on his own, but his team and the mentors he's surrounded with could help him through his current funk. His visible frustration clearly comes from expecting more from himself and still struggling. Maybe it'll take a sports psychologist to help him through that. But his reactions should at least be understandable.
It seems he really wants to be the star that matches his second overall billing, but things aren't going well. Part of that might be the way he's being instructed to play, part of that might be what he's taught or not being taught in practice, part of that might be gripping the stick too hard and second guessing every play. No one on this board can really know for sure what combination of those factors are at play here.
But like @AngelDuck said, he's still learning how to play at the highest level of the sport. For some kids it comes naturally. For others, there's a longer adaptation period. What I am left questioning is if the coaches are doing enough to foster his strengths and work on his weaknesses. From what I've read from Cronin's comments on what they're teaching him, I'm not so sure that they are.