[MrB]

There is no historic or biblical basis for accepting “snark” from children at all. This is a fairly historically recent development, and it all comes from the rejection of traditional (biblical) values.

Children obey your parents, honor your father and mother,

neither have a “unless you’re a teenager that knows better than your parents” caveate.

[St_Thomas_Aquinas]

I agree. I think it's also because, relatively speaking, parents are strangers to their children. After all, if society determines that children should spend more time in school than at home, what is a child to conclude about the relative importance of each?

Sadly, parents become interlopers in their children's lives. Why wouldn't teens treat parental intrusions into their lives with disdain? Who are they to give orders? All children are special, and probably smarter than their parents, who still cling to old-fashioned religious beliefs.