When Emily Nussbaum introduced Alan Cumming at the New Yorker Festival, she said, “Plenty of actors light up a room, but Alan Cumming is more of a disco ball—reflecting every possible angle of show business.” Cumming appears in mainstream dramas such as “The Good Wife,” and also more indie projects like his one-man version of “Macbeth”; his performances in musicals such as “Cabaret” are legendary. He also owns a nightclub; his memoir “Not My Father’s Son” was a bestseller, and so on. And Cumming plays the host on the Emmy-winning reality show “The Traitors.” He combines “a dandy Scottish laird—sort of James Bond villain, sort of eccentric, old-fashioned nut who has this big castle.” Spoiler alert: “It’s supposed to be my castle. It’s not.” Nussbaum asks about his perspective on reality TV before he started on “Traitors.” “Zero, really,” Cumming confesses. “I was a bit judgy. … The thing I don't like about a lot of those shows is that they laud and therefore encourage bad behavior and lack of kindness.” Before “The Traitors,” Cumming’s first brush with reality television was on “Who Do You Think You Are?,” a BBC genealogy program that confronted him with shocking secrets about his own family. “It made a good memoir, I suppose,” he jokes. “Just how awful that was. It was awful. But no, I don't regret it.”