LOL. You truly have no historical perspective.
So what about baby boomer's grandparents complaining about baby boomer's parents?
In this part of the US they were heavily immigrant. And they survived the Depression. I had the pleasure of knowing some great grandparents, and I never heard them whine about my grandparents. They were proud of them. They taught them English and American culture.
OTOH, this board is a great case study in the boomer generation. The music is too loud, kids today can't write in outdated formats or read in dead languages....you know my grandparents spoke jilted Southern Italian dialects and I never once heard my grandparents complain about my parents inability to do so, despite those languages actually having more use than cursive or Latin. Meanwhile we have boomers cheering when Spanish is deemed a language of the poor or candidates get scolded for using it.
Not to mention, if you talk to many millenials they could actually not only discuss EDM but the Beatles, the Who, plenty of classic rock music their parents listen to. In fact the only music I really hate is country and that goes for most people in NJ. Yet the stadium is not the only place where boomers complain about loud EDM or rap being vulgar or whatever it is that hurts their ears.
Maybe millenials will act that way towards their children, we'll see. But the boomers are truly exceptional in their ability to critically judge their parents and children while viewing themselves so exceptionally. It wasn't the millenials that called them the me generation, was it?