The arm up near the neck is problematic, but at 6 ft 8 in tall I'm sure things are different. He's gotta be careful with that.
But this thread definitely shows a large majority of posters here started watching hockey when the league was removing hitting as a part of the game. Every big hit has people outraged, even ones clearly legal.
Just like in football, they are making things somewhat unrealistic by limiting physical contact in physical sports. A large object in motion tends to stay in motion. With hockey people are constantly assuming players are aiming for the head or trying to hurt the player, even if that isn't the case. I understand Rempe's arm against his neck is not that, but many other times people freak out. Again though, if he wasn't so tall, that arm would have been against his back. So he has to learn to be careful with hits. But doesn't mean he's some scumbag trying to injure.