Same in britain in my experience, political party affiliation matters a lot less than how many reasons you can list why britain is the greatest nation in the world.
Mmm...no. I think you'll find most people int he UK are pissed off because it's blatantly obvious that Britain is MOST CERTAINLY NOT the greatest nation in the world. Politics is something to argue about in the pub, but I don't think I ever associated with or avoided someone simply because of their political views (unless they were BNP people...of whom there are actually very few...by ratio).
In my experience, if you ignore the royal family (which represent a rather strange anomoly around which a sizeable plume of patriotism and severe oddness exists) people in the UK only get patriotic about sport. They get this burst of national pride to exactly the same degree as the Irish do whenever they play at some international game or other, but the difference is that in the UK everybody wishes the team would win something whilst remaining reasonably ambivolent towards the fortunes of other teams, whereas in Ireland everybody wishes the English teams would lose every match, regardless of what the sport is or who they're playing against.
On a slightly more serious issue, I am rather annoyed that the government sees fit to waste an innordinate quantity of money marching it's security forces up and down the street and keeping order amongst the populace whilst they watch the security forces march up and down the street, but they couldn't be arsed deploying those same forces onto the roads of our country to stop the idiots who continue to drive around with impunity, murdering innocent people and inflicting wholesale trauma.
But then I guess that just shows you how screwed up my value system must be. Perhaps in 100 years time the government of the day will be holding marches for the early twenty-first century drivers who "died so that we could escape the oppression of imperialistic speed limits and road traffic laws"...