Modernism: Master Narratives and metanarratives of history, culture and national identity as accepted before WWII (American-European myths of progress). Myths of cultural and ethnic origin accepted as received. Progress accepted as driving force behind history.
Suspicion and rejection of Master Narratives for history and culture; local narratives, ironic deconstruction of master narratives: counter-myths of origin. “Progress” seen as a failed Master Narrative.
Progress is seen as a failed Master Narrative by people who have an indoor bathroom they did not invent or build, and would not know how to fix.
Remember, in postmodernism, there are no facts, there is no evidence, there are only feelings and assertions.