Disrespect is the basis of a lot of humor these days, and kids learn from an early age to try to get away with as much as possible. Parents aren't teaching kids respect because it's an uphill battle against media and peer influences.
The older generations grew up with a lot stricter parents, I think.
Grammar: The difference between "knowing your sh*t" and "knowing you're sh*t."
"A world that is 'idiot proof' is a world that is only fit for idiots." - Racer X / 6'er