“When Frank Castorf, the avant-garde German director responsible for this confounding concept , took the stage with his production team, almost the entire audience, it seemed, erupted with loud, prolonged boos. It went on for nearly 10 minutes, by my watch, because Mr. Castorf, 62, who has been running the Volksbühne (People’s Theater) of Berlin since 1992, stood steadfast on stage, his arms folded stiffly, he sometimes jabbed a finger at the audience,essentially defying the crowd to keep it coming.”