I'm not sure that we boomers are crazier than anyone else, but there are enough of us that our voices carry. Musical snobbery has a long history, I think. As for rock-and-roll, it was a force, but it was far from the only thing going in popular music during the boomers' adolescence. This may have created anxieties for those who knew they were supposed to like the Stones (and did), but who also knew they were not supposed to like the Carpenters (but did). And there were the journalists who seemed to want to rule anything but rock out of the popular music world, so helping to feed the anxiety.