“Cannes selections of all stripes have met with boos for decades, from Michelangelo Antonioni’s groundbreaking L’Avventura in 1960 to Sean Penn’s not-groundbreaking The Last Face last year.” (Even Taxi Driver got booed.) There’s even been a “Booed at Cannes” film series and a streaming service category. Nicolas Rapold offers “a mini-anthropology” of the phenomenon.