I can answer this for you, OP.
All youthful rebellion seems relevant while it's happening. I've been part of many rebellious segments of society - born 1965, first year of Gen X.
First I saw the hippies of the 60's. I even went to early elementary school in bell-bottoms. I didn't hang out with them obviously, they were grown up and I was just a kid. But they certainly seemed to have a nice cultural niche going for themselves.
Then I witnessed hard rock culture in the 70's, pretty much first-hand. I mean I was listening to Kiss albums at age 7, by the end of the 70's I was in high school blasting the Clash out of my boombox.
I was very closely associated with 80's culture, that was pretty much my generation's decade, we were teenagers-to-young-adults, I was in a band, we were certainly rebelling against something, pretty sure it was anything that didn't seem fair at the time.
I was around for the 90's as well, by that time I was working in the radio business, doing a lot of coke, nightclubs, grunge was going to save rock and roll IIRC. Didn't work out that way of course.
Because here's the thing: In your youth, you share a culture with everyone around you. There may be subdivisions within that culture, but everyone is pretty much on the same page overall. All the kids you went to high school and college with, they were all listening to the same music, doing the same drugs, talking about the same issues, rebelling, sure, because there's ALWAYS something for the youth to rebel against.
But then people grow up. People get jobs. People get married, have kids, move away, drift apart. Eventually, whatever "movement" you may have been a part of in your youth has quite simply disappeared, no longer exists in any form.
So you know, yeah, cultural attempts to fuck The Man and so on. But they all add up to the same thing in the end - nothing. All your left with is the music. And this current generation won't even have that, because your music SUCKS lol.