old people don't appreciate the magnificence of the young.
I think you got that backwards there, big'un.
Young people in general can't appreciate the "magnificence" of their elders, simply because they aren't there yet. There's a lot to be learned from even the simplest of your elders, just because they've lived longer and have probably seen a thing or two that you haven't.
That old saw "youth is wasted on the young" is pretty much right on the nose. Older people do
appreciate youth, because they had it once. But once it's gone, it's gone. It ain't never coming back.
Disagreeing about popular culture is as old as the hills. It doesn't make us old folks wrong, and it don't make you whippersnappers right.
I was going to post, but since you said more or less everything I was going to, let me just add: well said.