I've never heard anyone in this country call something unCanadian. Nor have I ever heard anything called unRussian, unDutch or unGerman. I laugh when I hear the expression "unAmerican". It's an expression that could only arise in a society that is lost in both paranoia and delusions of grandeur.

Cheers LH, I suspect you are right.

(although please don't take that mean there are not perfectly reasonable Americans, I've not made some American friends, etc.)