Celebrity actor Mark Ruffalo publicly criticized Kevin O’Leary, the Shark Tank star, after O’Leary attacked Billie Eilish for her political speech at the Grammys. Eilish, who won Song of the Year for 'Wildflower,' used her acceptance speech to condemn ICE and advocate for immigrant rights, stating, 'No one is illegal on stolen land' and emphatically saying, 'F*** ICE.' O’Leary, a Canadian entrepreneur and Trump supporter, responded on Fox News, advising celebrities to 'shut their mouths and just entertain.' Ruffalo fired back on Threads, telling O’Leary to 'STFU,' criticizing his hypocrisy and defending Eilish’s right to speak out. Ruffalo highlighted O’Leary’s support for Trump and his role in the film *Marty Supreme* as a villain, mocking his political stance. The backlash extended to Eilish’s brother, Finneas, who called out the outrage from 'powerful old white men' and pointed to their possible connections to Epstein. Fans and fellow celebrities praised Ruffalo’s stance, with Kathy Griffin supporting him publicly. Eilish’s speech and her brother’s defense sparked widespread online support for her activism, emphasizing her message that 'our voices matter' and criticizing silence on social issues.