The children now love luxury; they have bad manners, contempt for
authority; they show disrespect for elders and love chatter in place
of exercise. Children are now tyrants, not the servants of their
households. They no longer rise when elders enter the room. They
contradict their parents, chatter before company, gobble up dainties
at the table, cross their legs, and tyrannize their teachers.
-Socrates. 470-399 bce
American society (unfortunately) has it's roots in puritanism. Our moral stances have been like a pendulum. Whenever we become too decadent, we swing bag to conservatism. When become too conservative, we swing back to decadence. The roaring 20's gave way to the 30's. The 50's gave way to the 60's.
Every generation has people who thinks things are going to hell in a handbasket.
Consider that Socrates wrote the above quote over 2400 years ago and consider for a moment what would happen if someone wearing a toga crossed their legs...
... while our youth and young adults can be promiscuous and make bad decisions, they haven't started casually flashing their genitals at one another as casually as they mouth off to a teacher.