Case in point: MTV of the 80s would play little to no black music. There's a famous 1983 interview bit of David Bowie where he asked the MTV VJ why they play no black music, and the VJ waffles a bit on the white suburban market. That does not sound very subversive to me.
Here's the excerpt: https://www.youtube.com/watch?v=XZGiVzIr8Qg&feature=emb_logo
you understand black americans have historically been repressed, right? this is pretty uncontroversial.
black american art, especially music, is absolutely saturated with themes of resistance, and even the mildest, most innocent examples have historically been perceived by racists and the establishment as dangerous and rebellious.
the 80s were at the tail end of white flight, when relocation of white people from diverse cities to majority-white suburbs was an explicit response to the desegregation and rebellions of the preceding years. mtv agents making a statement about suburban markets in that time has a clear meaning.
There's also the issue of how well you know them. When I was a kid myself, as far as I could tell, all 40 year-olds had dull, shallow personal lives and were boring people. I don't have that impression now than I'm in my 40s and my experience of the lives of 40 year-olds goes beyond being told what not to do by them every now and again. How well do you seriously know and understand the inner motivations of your friend's kids?
Wait, doesn't that sound like the same thing? Presumably some kids are still non-conforming, and they are still the minority (because most kids of all generations have prioritized fitting in).
Be very wary of survivor bias when looking back in time, especially when there is a risk of nostalgia. There was plenty of popular garbage in the 70s and 80s, there is plenty of good music being made now. The only real difference is that we have yet to apply the "is this good enough to keep around" filter to modern culture.