Charli XCX has nearly as many opinions about the world as people have about her. It’s what makes her such a smart pop star. She’s always championed the idea that pop should be an artform worth analyzing, dissecting, and even fighting over. This was true in 2014, when she tweeted, “I love people who get angry about pop music,” and raved about loving Becky G’s undeniable pop classic, “Shower.” It remains so now, as she satirizes Brat in the part-mockumentary, part-concert film, part-psychological