This is true in most scenarios, and the opposite is also true – that Americans are famously friendly, and even though Canadians may not want to visit to make a point, I think even they would agree that most day to day interactions they'd have would be warm and welcoming.
There might be a bit more hockey ribbing for the next few weeks, but I know there's a ton of respect for Canada's team.
At the end of the day, the idea of "My problem is with the government, and not the people" is as old as time.