Thanks for putting like that. And you're right - I confess that I don't "get it".Nope. That's the difference between American and European culture. Nothing wrong with it, but this is something that Americans (usually) don't get. We don't want to think that our country is "the greatest". We are not even sure what it means. You would be hard pressed to find any European proclaiming that his country is the greatest (and the ones that do, they are usually crazy white-power nationalists). You won't find cultcross going around proclaiming that England is the greatest, or Deckerd about Scotland, GodBen for Ireland, Shaytan for France, Naira for Greece, and for the sake of my own life, you won't find me claiming that Italy is the greatest country evah (except, maybe, in jest. But even then, I'll need a shower after saying that). The common sentiment is that our own country is usually ok, better in some instances, worse in other. Even if we think our country is pretty cool, it would sound stupid to claim it's "the greatest". "Greatest" in what? What parameters are we using? Wealth? Military power? Health care? General happiness of the population? Average length of penis? The answer, obviously, is that it's just silly. It's not a competition.I think it's natural for people to want to think that their country is the greatest. We just need to recognize that people from other lands can feel the same way about their own homes.
A lot of Americans (nice, sane Americans, not the crazy ones) aren't very shy of claiming that "America is the greatest country on this Earth". And are baffled that we don't share the same feeling.
We understand. But it makes us cringe nonetheless.It's a matter of pride, not so much a statement of fact, IMO, anyway.

To assign parameters would make it too much like a claim of fact. It's not the greatest of anything in particular - it's like cheering for your home team during the Olympics - even if you don't win a particular event, you can still be proud of your country. Or am I still way off-base?