You are safer travelling if you're known as a Canadian. I experienced this first hand while I was backpacking in Italy.
Anyways.
There's a general dislike for Americans as the stereotype over most of the world is that they are loud, rude, obnoxious, aggressive, etc. If you're Canadian, none of those stereotypes are there, except that we are nice, kind, and giving.
Oh, and please, my fellow American GFY'ers, don't act shocked please.... That truly is how your country is viewed (stereotypically) and I don't think this war will help that any..
Cheers,
Matt