Dutch historian Rutger Bregman, who became a viral sensation for his blunt talk on taxing the rich, was recently interviewed by Fox News host Tucker Carlson.

The pleasantries didn’t last long, as the chat quickly turned nasty when Bregman pointed the finger at Carlson and his ilk for being part of the problem. “Tucker Carlson just called me a ‘fucking moron’ during a prerecord for his show, for pointing out that he’s a millionaire funded by billionaires,” he said afterward.