Musk, who spent part of last week kissing the ass of the Chinese government, didn't have words quite as kind for U.S. President Joe Biden this week.

Instead, after Musk's SpaceX completed a flight on Saturday, Musk took to Twitter to jab President Biden, who had not remarked on the company's accomplishments.

Musk was asked: "The President of the United States has refused to even acknowledge the 4 newest American astronauts who helped raise hundreds of millions of dollars for St. Jude. What's your theory on why that is?"

"He's still sleeping," Musk responded.