Not that my sample size is that huge, but to counter this article, my girlfriend is an elementary school teacher, in the US, but in a VERY multicultural school. Apparently the one French kid in class is the biggest little snotty shit, and his parents are mad uptight.
Imagine being taken from a society where the rules are constant and fair, which rewards patience and where fellow children are well disciplined and patient.
Now drop into an American classroom.