Mark Ruffalo told Kevin O'Leary to "STFU" after O'Leary criticized Billie Eilish’s music and persona.

Mark Ruffalo told investor Kevin O'Leary to "STFU" following O'Leary's criticism of singer Billie Eilish, reportedly dismissing O'Leary's remarks about her music and public persona. The exchange occurred during a public event, highlighting growing tensions between the two figures over artistic expression and public commentary. Ruffalo defended Eilish, emphasizing the importance of respecting creative freedom.