Billionaire Elon Musk threw shade at billionaire Jeff Bezos in an interview with Financial Times.

Musk said Bezos is “reasonably good engineering aptitude,” but that he thinks Bezos “does not seem to be willing to spend mental energy getting into the details of engineering.”

“[He] does take himself a bit too seriously,” he added. “In some ways, I’m trying to goad him into spending more time at Blue Origin so they make more progress. As a friend of mine says, he should spend more time at Blue Origin and less time in the hot tub.”

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