Few of us like to be that we’re average, and Americans are no exception. Far worse, however, is to be told that we, or the things we do, are typical of our nation. “Oh, that’s so typically American” is the kind of statement most of us object to. Generalization about nationalities (Americans are incurable optimists, German are professional pessimists, and Italians are amused by both) are usually not welcomed, even when they’re basically accurate.
With Americans, this reaction may even go deeper. One generalization often made about Americans is that they value their individualism quite highly. They place great emphasis on their individual differences, on having a great number of choices, and on doing things their own way. This is perhaps why general statements about American lifestyles are frequently resented by Americans.