Hippies were a type of young person in the 60s whose parents were capitalist enough that they could afford to maintain their offspring's anti-capitalist lifestyle.
Hippies will look at any issue facing the current, modern world and suggest a completely retarded solution, as shown in the graph below.
Although hippies had little or no lasting impact on the geo-political world, they weren't completely worthless:
Woodstock marked the apex of all that was sought to be achieved in the 60s, appropriately taking place during the last days of Summer, 1969. From this point on, everything was horrifically ugly and offensive to hippies.
Funnily enough, hippie icon Bob Dylan, never played at Woodstock, because (according to Wikipedia) his son was ill and he "was unhappy about the number of hippies piling up outside his house."
"What the - ? Scram you filthy bums!"
Overall, the festival was said to be kick-ass awesome, thanks to an inspired (read: off the fucking wall) performance by Jimi Hendrix (and, if you watch the film, a young man on the bongos so full of amphetamines his eyes look like approaching asteroids) accompanied by probably the most drugs ever taken simultaneously outside of a Quentin Tarantino brainstorming session.