As far as I know the most wrong we've done is destroy the Native American culture, which I admittedly am not proud of. The only other gripes I have is that we decided to go to war in the middle east. Other than that Canada is usually helping out the victims of war, cleaning up messes America, or any other country for that matter, has made.
You instigated this argument. You pointed out how you disliked Canadians for a reason, I replied with why I disliked Americans for a reason. You took it as an attack, when it wasn't.
As for my arrogance, maybe I was a bit, I'm sorry for that.
Also, I find most Canadian stereotypes comical. For example, we have a stereotype that we live in igloos. It's easier to laugh at the ignorance rather than be offended by it.