“Those Filthy Hippies”
The Hipster movement is nothing new, but the name certainly does change among generations. Beatnik, Hippy, Punk. Having a culture that actively pushes against the mainstream is important to have, not because having a contentious disdain for the status quo is generally a healthy lifestyle, but because it leads to new styles of art being actively developed in protest of the status quo.
The general counterculture cycle is this: something becomes mainstream -> counterculture goes against the mainstream -> new art style develops -> art style becomes popularized -> style becomes mainstream.
Most new art styles are evolutions of but also direct responses to the previous art styles. The more that the mainstream leans towards something, the more there is a pull in the opposite direction from this counterculture.