Mark Ruffalo, an actor and outspoken critic of the Trump administration’s approach to immigration, hit back at Kevin O’Leary after the Shark Tank reality-TV star criticized Billie Eilish‘s anti-ICE Grammys acceptance speech. Shortly after Eilish used her platform to reach millions across the globe, O’Leary appeared on Fox News to bash celebrities who get political. “Kevin O’Leary why don’t you STFU. It’s hilarious,” wrote Ruffalo. “Seeing a lot of very powerful old white men outraged about what my 24 year old sister said during her acceptance speech,” he wrote on Threads.