Manolo says, look, the calculating hippie devils behind the Birkenstocks, they enjoy the abuse heaped upon them by the peoples of sensibility and style. “Nothing says, ‘I want to tell you how to live your life’ more than Birkenstocks,” said Jason Reitman, the director of the film, which is to open in New York, Los Angeles and Washington on Friday. “The visual registers immediately. There’s something about the shoe that is universally understood that makes it so funny.” The sandals are emblems of liberal do-gooderness, he said, and the senator — a villain in the movie — wants to “regulate…