Americans outclassing Canadians?

So in game 3 of the Montreal/Boston playoff series a bunch of Montreal fans booed The Star Spangled Banner. Obviously I’m not gonna bite on major stereotypes (ok, maybe I am) but that’s incredibly classless and something you’d more or less expect from sports fans over here. So how did their American counterparts respond. Aside from a few boos, Bruins fans cheered the Canadian national anthem. Wow, I never expected a group of Americans to actually take the high-road, especially in an incident such as this.