Maybe of course exagerated but someone said that many years ago they were at an Ineos meeting that he attended and there was fruit on the table. When he came in he demanded to know who'd paid for the fruit "was it us?"
Reminds of Michael O'Leary famously refused to buy stationary for his staff, they had to buy their own.
And a mate of mine has a restaurant in Yarm. Bannatyne ate there and knocked over a bottle of wine with only a glass left in the bottle and demanded a full fresh one.
Some would say it's that drive, determination and attention to detail that got them where they are, me, I'd say it's as much about them being really not nice people.