a usually young person who rejects the mores of established society (as by dressing unconventionally or favoring communal living) and advocates a nonviolent ethic ; broadly : a long-haired unconventionally dressed young person

http://dictionary.reference.com/browse/hippie

a person, esp. of the late 1960s, who rejected established institutions and values and sought spontaneity, direct personal relations expressing love, and expanded consciousness, often expressed externally in the wearing of casual, folksy clothing and of beads, headbands, used garments, etc.

So, good sir, I believe you should rethink insults of folk revised as Neil Young via Beach Boys. Vocal harmonies! Plucked guitar! Reverb !!