I think they were doing it because some fans become overcome by the "spirit of their game" and have to "root for their team" and were just "BOOing" because the opposing team happened to be from another country and it was their (as in the opposing team's) anthem... *shrugs*...
But I don't get the whole US vs. Canada thing...
Like awhile back on a game called Subspace, there was this Squad (basically like starcraft clans, except you actually create them with a password you need to join, and you get the name of the Squad by your name) called like Canadians or something... and it was just a bunch of canadians that would sit around CONSTANTLY saying negative things about americans... and it would send a ton of people in the zone (basically a game... but it usually had at least 25 people in it... most of the time even more... sometimes in the hundreds I think) in this giant arguement and it was SOOO annoying... they even had this dumb kill message like "*person they just killed*, you must be from America because that was way too easy" or something to that extent...
Then there's people like my brother who seem to hate Canada for no particular reason...
But in this case, I think it was probably just some crazy fans booing the visiting team
