Robin has an idea for a horror movie about hippies, and it would be a mix of The Wickerman/Midsummar and Cannibal Holocaust!
Civilised people and the hero watch found footage shot by a film crew on a remote island who is said to be burned alive by hippies. Finally: the truth is: the bad guys are the film crew who go to a hippie sect on a desert island and behave barbarically until they are finally locked in a hut by the surviving hippies and set on fire. The hippies weep with happiness, ruffle their hair, scatter flowers and sing in honor of the gods.
After watching the film, the hero goes home thinking, “Who are the real hippies here?”