Billie Joe Armstrong donned a Brat hat, and Tré Cool responded to Charli's "Miss Should Be Headliner" sash with a toilet paper sash of his own

At a Coachella 2025 weekend one after-party, Charli XCX donned a “Miss Should Be Headliner” sash. While the move brought joy to her fans, Green Day fans found it to be disrespectful (or dare I say bratty).

Green Day is officially brat. As the punk band headlined Weekend 2 of Coachella, they exchanged some playful barbs with Charli XCX, who also performed at the 2025 music festival in Indio, California.