Acid Western

Acid Western is a sub-genre of the Western film that emerged in the 1960s and 1970s that combines the metaphorical ambitions of top-shelf Westerns, like Shane and The Searchers, with the excesses of the Spaghetti Westerns and the outlook of the counter-culture. Acid Westerns subvert many of the conventions of earlier Westerns to "conjure up a crazed version of autodestructive white America at its most solipsistic, hankering after its own lost origins." Wikipedia