Quote time, is it?
"Nationalism is an infantile disease, it is the measles of mankind." Albert Einstein.
That being said, I find the American version of patriotism to be pretty awesome, and find it's best understood with a bit of humour. While I think senseless nationalism is dumb, a national ideal of "Whateva, I do what I want!" is a perspective I can enjoy.
I mean, just look at that video. That is wonderful.