During her headline set on the Other Stage at Glastonbury 2025, Charli XCX faced backlash from some viewers—especially on BBC livestreams—who accused her of lip-syncing and overusing autotune. The pop star pushed back on the criticism, dismissing it as "boomer vibes" and asserting that deliberate autotune and a backing track don’t undermine her artistry. She emphasized that "the best art is divisive," while supporters highlighted her high-energy performance and vibrant "Brat Summer" visuals.