You wanna GUESS why people are mad at Charli now? Photo: Francis Specker/CBS via Getty Images Charli XCX brought out Troye Sivan, Lorde, and Billie Eilish at her Coachella set on April 12, but the most noteworthy cameo wasn’t any of her featured artists but a sash she wore at an after-party later that night. “Miss Should Be Headliner” pays homage to Miss America competitions and references the singer’s relegation to an earlier time slot above that night’s headliner, Green Day. In the photo,