Do you have relevant examples (or even better, some statistics)? How do you measure this and how do you know if they were assholes or not? I guess you don't have a record of SLT meetings of large companies (as you have access to the emails between Linus and the maintainers).

Leaders of large companies are _usually_ more aggressive, selfish and less agreeable than average people. This is a well-researched topic (and also makes sense intuitively -- leading a Fortune 500 company comes with so unique perks that there's an immense fight for those roles).