"Redneck" and "Hippie" became important cultural terms at about the same time -- the 1960s.
"Redneck" has been used and misused into oblivion. The classic redneck is a southern white farmer whose neck is red because he works in the fields. The classic term may have been coined after the Civil War ended. But there are cultural traits of the "redneck" that have nothing to do with farming.
Southern whites came from 17th century northern England and Southern Scotland, for the most part. They brought with them an honor code culture, meaning you wear your sensitivities on your sleeve where they can most easily be offended (there is a note of sarcasm in my definition). The southerner prefers minimal government, and especially any activity of government which might inconvenience him. They generally practiced do-it-yourself justice where they could get away with it. They tend to apply the "shoot first and ask questions later" approach.
The southern redneck culture resides in southern whites and blacks, though it might be located as far north as Duluth. It is primarily a working class culture.
Farmers and working class people across the northern tier of states are not rednecks for the most part. The social culture in this part of the country is much like that of Puritan New England and Scandinavia. In this system the state is a central institution, and values are more communitarian rather than individualistic.
Hippies: In fact, there never were very many genuine, registered hippies. There were, however, a lot of college aged people and college students or grads not otherwise employed in the U.S. Army or Corporate establishments who wished to be hippie-ish. People like me and my friends, for instance.
We found jobs that allowed for flexibility--some days working very hard, some days not--and spent a lot of time discussing the war, the riots, famous communists (Trotsky, Mao, etc.) and enjoying urban life (this was in Boston). It was all pretty much good.
Soon enough, though, we shelved our sandals and bell bottoms, got some standard threads, applied for real jobs, and took jobs with the assumption we would be inside agitators and continue the revolution from within. We were not very successful, of course. The corporation and the republic for which it stands are all doing fine.
As for the real hippies, the hippest hippies were beatniks (beat was a shortening of "beatitude"). The beats were hard core to the hippie soft core. What the hippies wished to do had been already been done by the Beats and other decadents.
All this was not my view at the time. (I was buried in the darkest corner of the upper midwest at the time, and the hippies seemed like avatars of the New Age.) It's only recently that it has become clearer to me that hippies were just strung out beatniks. Or visa versa -- hard to tell at this distance.
At any rate few hippies founded anything or caused any sort of boom. Real beatniks and real hippies were alienated people, and alienated people usually aren't on the cutting edge -- why would they be?
As for rednecks, they too were, are alienated. They find an acceptable society among themselves (in their millions), but by preference, I think, they prefer to be outsiders to the larger community. Outsidership is the cost of rigid individualism.