trying to contrast the 90s against the 60s is...
did you live through the 90s? because it was an era of 60s retro. that was the dominant cultural movement at the time, and i think probably the first retro movement, in this unending stagnation that's set in since. if you hate retro, blame the 90s, because that's where it started.
it was also the last gasp of the 60s underground, in the sense that anything that was still floating around from the 60s met it's conclusion in the 90s. queen and led zeppelin both had chart topping records and singles in the 90s. david bowie released some of his best records. was nirvana's biggest hit actually their cover of the man who sold the world? alt rock band after alt rock band went platinum by ripping on combinations of baroque pop, psychedelic music and guitar rock. bands like oasis were huge. there was an actual indie rock scene, in a way that doesn't exist today. that all started to disappear after the electronica craze in 1997/1998.
so, this idea of contrasting the 90s against the 60s is just a weird thing to hear that doesn't really conform to the facts; the 90s were both a recycling of the 60s and the logical conclusion of them, not out there in some proposed opposition to them.