The point is, every older generation believes the world is going downhill, as evidenced by the way the young behave. Most young people get a bit obnoxious in a group when away from the eyes of family, and always have done.
I'm not sure. I feel there is a difference, less respect, more entitlement, more rowdiness , less awareness of others. I also do not think it's just youngsters, I have seen many grown adults behave like this. It's often background low-level anti-social behaviour, but I feel the background level to what is now acceptable has risen slightly.