The crowd who has the whole "my country is better than yours" attitude in a manner resembling the way one might root for a home sports team, who will blindly support any policy of our government even if wrong, or who assumes everyone outside of America is living in some mud hut without knowing anything about the country in question is ignorant.
However, legitimate criticism, even harsh criticism, of another culture if you actually know something about that culture, or support of American government policies that you have thought through and agree with is not jingoism.