My brother went to a private school that rumors say that when they played at public schools from the less affluent parts of town, the students shook their car keys at opposing teams. I never witnessed it myself but almost threw up in my mouth a little when I heard that.
Similar attitude.
(FYI - my brother went there due to a combination of the following circumstances: the public schools where we lived was a slight degree above tolerable, the parochial school in the area was a year away from shutting down, and my mom taught at another private high school and got a significant tuition discount. And it was/is a pretty darn good school, both academically and in sports. It's just pretty doggone snotty.)