Fans speculated that she was shading the rock band — made up of Billie Joel Armstrong, Tré Cool ... green day stans arguing over a sash when between the actual artists, it's probably funny ...

Finally, Green Day did respond, and in characteristically cheeky and slightly self-deprecating fashion. At some point, a photo surfaced online of drummer Tré Cool wearing a sash of his own ...

Green Day drummer Tré Cool has responded to Charli XCX by sporting an “Actual Headliner” sash at Coachella this weekend. The ‘Brat’ star ruffled some feathers last week when she was seen ...

You know who found the sash funny ... Tré Cool also sported a response sash, which read “Actual Headliner.” Charli retweeted it with the comment “obsessed.” So yes, Green Day and Charli ...