The refs called a dubious charging penalty on Elias Pettersson, but he wasn't even moving. According to Rule 607, it's on the player making a hit with excessive force to make sure they're not putting their opponent in a position to be severely injured.
Canucks fans are some of the most passionate in the league. They bleed blue and green, and they take their team's success to heart. So when they feel like their boys are getting the short end of the stick from the refs, they're not afraid to make some noise—literally.
However, beer tossing isn't the best way to express discontent. It can be dangerous, not to mention a waste of good brew! So, while we understand the passion behind it, there are definitely better ways to show support and vent frustrations.