Ruffalo to O’Leary: “STFU”

Actor Mark Ruffalo has ignited a viral social media feud with Shark Tank star Kevin O’Leary, firing back after the investor criticized Billie Eilish for her political comments at the 2026 Grammy Awards.

The exchange, which took place on Friday, February 6, 2026, saw Ruffalo calling out O’Leary’s “double standards” and making a pointed jab at his recent acting debut.

The Spark: O’Leary’s “Entertainer” Rule

The conflict began after O’Leary appeared on Fox News to voice his disapproval of Eilish’s acceptance speech, in which she addressed the administration’s new immigration and climate policies.

• The Quote: “It’s the first lesson 101 for celebrity: as you rise up… shut your mouth, and just entertain,” O’Leary told the network. He argued that artists risk alienating half their audience when they speak on public policy.

The Clapback: Ruffalo Defends the Artist

Ruffalo, a long-time activist himself, didn’t hold back in his response on X (formerly Twitter), accusing O’Leary of being a hypocrite.

• The Defense: Ruffalo noted the irony of O’Leary—a man who spends his career giving opinions on television—telling a global superstar like Eilish to stay quiet.
• The “Dwarf” Comment: Ruffalo wrote that Eilish “dwarfs anything you dream of doing” and slammed the “fantasy double standard” O’Leary lives in.
• The “Marty Supreme” Diss: Ruffalo ended his post with a sting, writing: “You played yourself well in ‘Marty Supreme.’” —

Context: O’Leary in “Marty Supreme”

The jab refers to the upcoming A24 film Marty Supreme, starring Timothée Chalamet. O’Leary was cast in a supporting role for the project—a move that was met with skepticism by the film community when it was announced. Ruffalo’s comment implies that O’Leary’s performance as a “smug” or “antagonistic” figure wasn’t acting, but rather a reflection of his actual personality.

Celebrity Politics in 2026

This spat highlights the ongoing tension in early 2026 as the entertainment industry clashes with the new administration.