The tech billionaire slammed the Minnesota governor as a “huge jerk” for poking fun at the company’s stock market troubles.

Crowds have protested billionaire Elon Musk’s purge of the U.S. government under President Donald Trump outside Tesla dealerships throughout the U.S. and in some cities in Europe.

The plan for a day of mass demonstrations follows a series of violent incidents. Anti-Musk activists have been accused of throwing Molotov cocktails at Tesla facilities in Colorado, Nevada and Oregon and defacing Tesla vehicles there, and on Monday, authorities said they found multiple “ incendiary devices ” at a Tesla location in Texas.