Canadians are a little prickly on this issue, it depends how tongue in cheek the joke is. We don't mind South Park's "Blame Canada" because its ridiculous, but if you call us "the 51st state" you will see that all Canadians carry a little Wolverine-style berserker rage inside. A good equivalent would be how New Jersey can make fun of itself, but they won't take any crap from New Yorkers. Hey, it's tough to live next to a self-obsessed super-power and still feel independent.