In early December, Netflix dropped its highly anticipated musical comedy “The Prom,” starring Meryl Streep, Nicole Kidman, Andrew Rannells and James Corden asfading Broadway stars who set out to help a lesbian teen take her girlfriend to the prom. The film, helmed by out director Ryan Murphy, got mixed reviews, but some lambasted it as “homophobic” and “offensive” because of the casting of Corden, a straight actor, in what they saw as an “aggressively flamboyant” caricature of a gay man. Erik Anderson, who runs the film site Awards Watch, called “The Prom” a “gorgeous and vibrant production” but tweeted that...