Charli had ruffled feathers last week by wearing a "Miss Should Be Headliner" sash
It comes after Charli was pictured wearing a "Miss Should Be Headliner" sash, which fans interpreted as a dig towards the band
"You know I respect you brother"
Footage of the moment was caught by a person in the audience
"Artists are supposed to stand for something, not be petty losers," one wrote
Frontman Billie Joe Armstrong sang: “Runnin’ away from pain like the kids from Palestine," during the band's debut performance at the Californian festival
“They’re running out of gas. There are no bathrooms anywhere," said one attendee. "People are literally using the bathroom behind bushes like animals, and they paid over $600 to be here"
Green Day are set to headline the Californian festival later today
The album will be released next month
Confirmed headliners include Lady Gaga, Green Day, Post Malone and Travis Scott