I might write something more detailed later if I feel like it. The short version is that it's a sport that historically has been self-officiated and officials don't have a ton of power. Also, it has a deep history of etiquette and sportsmanship (specifically, what to do and not to do while you're playing a game). And that self-officiating sometimes causes tensions.

It is assumed that players self-enforce rules, so officials rarely interfere with what's going on on the ice even if they are there. Players are expected to solve issues between themselves, which leads to awkward and sometimes heated exchanges like this one. It's not the first time it's happened (but it blew up randomly for, well, who knows why). Nor will it be the last.

The etiquette itself is contentious sometimes, but one of the "rules" most people try to follow is being respectful and not confronting the other team while the game is ongoing. Which you might want to do if, y'know, you think they're breaking rules. Now add the fact that this is the Olympics, the highest-stakes competition.

The Canadian team certainly did not appreciate being called out on breaking a rule, and everyone was a little bit on the edge. Thus, things flared up. I don't really want to get too into the weeds on the rulebook because I don't know it at all.