*****COMET-SIZED SPOILERS AHEAD!!***** Writer/director/producer Adam McKay is known for poking fun at television conventions (“Anchorman”) and politics (his “Saturday Night Live” shorts). With Netflix’s “Don’t Look Up” (2021) he takes aim at the current distrust of science and common sense, using a planet-destroying comet as broad metaphor for COVID and climate change-denials. McKay also skewers…