Elon Musk said he isn't the 'biggest fan' of Warren Buffett. The billionaires have butted heads before.

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· *Elon Musk revealed he isn't the "biggest fan" of Warren Buffett on "The Joe Rogan Experience" podcast last week.*
· *The Tesla and SpaceX CEO said the famed investor and Berkshire Hathaway boss has "kind of a boring job."*
· *The pair have butted heads before: Buffett said he wouldn't invest in Tesla in March, and...