Well, as a card carrying boomer, I’d have to say that they were right. I thought all that stuff was awful. Every time I hear a Fender Rhodes Piano, my skin crawls. After a while, they started celebrating it, in an ironic, “this was uncool, so we’ll make it cool again although it’s still really kinda cheesy” manner. Who do you think are playing in these current cover/tribute bands, for the most part, anyway? It’s no different than the 70’s take on the 50’s, ala’ Sha Na Na, turning it all into a bad paraody, a joke, with Happy Days being such a bunch of crap as well.
FYI, millenials are now getting old, and being bashed by Gen Y and Z. Go peruse Buzz Feed.