No People Skills
Elon Musk’s brother Kimbal said that his brother is a “business savant” but “lacks empathy.” This is potentially the understatement of the century because Musk is terrible at dealing with people. He infamously accused a heroic British rescue diver in Thailand of child abuse after the latter rejected Musk’s help.

Meanwhile, he treats his workers horribly and fires them with little to no notice. Musk even goes head-to-head with U.S. senators and uses petty insults. He picked a fight with Sen. Ed Markey on Twitter but this was a mistake. “Fix your companies or congress will,” Markey warned as he put Musk in his place (via Rolling Stone).