I suppose I was a bit too specific. I was talking about people who complain about the United States without any context. To say that this nation's education system and general public health sucks considering how wealthy it is per capita is perfectly acceptable, but to just whinge about how the country has no culture or about how everyone is stupid really grates on my sensibilities.
The thing is, these people have traveled a lot but I suspect that they have no impression of what it's like to have lived in a nation for a substantial proportion of one's life, or how one's perceptions might be colored by one's age and situation. I have fond memories of South Africa and I could easily make blanket statements about how everyone was really nice and made great food, but the fact is that the country is a far more complex beast than the suburb where I grew up from age 3-8. I wish these people could meet a few immigrants once in a while, just to give them some perspective on how great we have it here. The US still has the highest percentage of the world's immigrants and the highest gross number of immigrants. This nation has flaws but I suspect many of them are not uniquely American as these witless sods imply.