Paul Thomas Anderson’s “Phantom Thread” is the portrait of an agonized and repressed gay man — cloistered, fastidious and virtuoso — in the “pre-gay” 1950s. It’s a time when the only classification for a relationship of mutual admiration, exploitation or obsession between a man and a woman was romantic love.And then it gets weird.Reynolds Woodcock (Daniel Day-Lewis), proprietor of the House of Woodcock couture atelier in London, learned the dress trade from his late mother to …