I've actually watched that documentary, pretty good!
Lol on the topic of "You Kids and Your Music!" I was born in the right time I guess, where MTV ruled the airwaves with actual music videos. Born too late to enjoy the wave of the late 60s to all the 70s great music, but old enough to appreciate that era entirely due to my dad being of that time and getting his album stash. So, I got to enjoy everything from (A)c/Dc to( Z)Z Top.
The thrash thing kicked off right before I was born but hit it's highmark when I was 3-4, which I can remember vividly from seeing videos of bands like Metallica, Megadeth, Anthrax, Overkill, Testament and Flotsam and Jetsam air on MTV Headbanger's Ball when that show debuted ( Adam Curry, pre-Ricky Rachtman); funny thing was I never saw a Slayer video on there until around Seasons in The Abyss.
I remember the night Headbanger's Ball debuted because it was like 2 months after we moved out of the ghetto apartments and into the house my folks still live in lol it was the first program aimed strictly to metal which had showed that it finally hit the mainstream after years of being considered underground.