The public school in our area is also an issue. They culture there is sports and if you don't do sports you don't count and it comes from the administration more than anyone else. They also have no discipline for the kids and let them behave as wild and rude as the kids like. Our oldest went from C/D average to honor roll when we moved to online public school where they were interested in teaching.
TV shows also have a lot of "humor" where they put each other down all the time and that gets copied by the kids as well.
I agree with the above about kids acting on emotion rather than critical thinking. I know several high school kids that melt down as soon as someone disagrees with them. They don't know how to debate or even convey why they think the way they do. No wonder Starbucks does so well!