It's simply down to bad parenting.
The bad parents give their kids everything they want, they don't discipline them or make them do chores.
They let them watch tele and play on PS/box's whenever they the kid decides.
They let them have tele's in their bedrooms.
They reward their bad behavior with bribes.
They don't let them out to play.
They drive them to school instead of making them walk.
The list is endless.
The kids have absolutely no respect for their parents, so why would they respect anyone else??
And no I don't have kids of my own, and don't want any either thx