“When did America become a nation of weenies?” FX’s John Landgraf asked the Arclight crowd at the Monday premiere of “American Horror Story.” “Ryan Murphy and Brad Falchuk were not afraid to create something original.”Spooky drama is a “coming home” for the “Nip/Tuck” duo, said Landgraf, and Murphy agreed. “They haven’t given me a single note yet.” The cast wasn’t afraid to dive in. “I had to get naked on my first day on set,” said Dylan McDermott. Sarah Paulson, who plays a medium in the series, said, “I go to psychics but only believe them when they say I’m going to win an Oscar.” At the Roosevelt Hotel after-party, Jessica Lange graciously declined interviews. Taissa Farmiga was less gracious.