#1: He hates sneezing

As chairman of the most prestigious professional wrestling company on the planet, Vince McMahon is used to being in control over every aspect of his own company. His domain of influence can extend over his company and into his own body.
On that same podcast mentioned earlier, Paul Heyman told a story where he was pitching a storyline to McMahon, who was buying into Heyman's vision until a catastrophic, monumental disaster happened, which would change the fabric of reality forever. Vince McMahon sneezed.
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Once he discharged his snot, McMahon muttered to himself until Heyman asked him what was wrong.
McMahon responded, "I sneezed... I should be better than that, I should be able to control that." Heyman innocently asked Vince if he hated sneezing and McMahon said, "In my world pal, there is no sneezing."
McMahon may be a billionaire, one of the biggest names in wrestling, and arguably the greatest heel the industry has ever seen, but it seems there are some small things that still get to him. Hopefully he carries a tissue with him at all times.