It's the opposite of The Breakfast Club, with the outsiders rising up against (rather than befriending) the prom queens and jocks, but it also has more of a sense of a school as a complete unit, a complete society, rather than sections of cliques.
If a Hughes film like The Breakfast Club is noteworthy for painstakingly finding the shared humanity and multiple dimensions that define characters from all backgrounds, Heathers stands apart for its utter cynicism towards everyone.