I'm not sure. The feeling started when I was still at home (so, a teenager) and my dad was waxing lyrical about patriotism during WWII. It gave me the creeps because it seemed to involve a certain anti-everyone else stance. Maybe not much, but a bit. Then, later, and now, I don't know if I could ever fight for my country because that would mean acknowledging that we were right, and we so seldom are completely so. I guess what it comes down to is that it seems like a very primitive sort of emotion to me.
That said, when I was working in Thailand and saw how different things were there, I often felt glad that I was European/'western': health care, education, etc.