I dont think it even has to do with intelligence necessarily. The vast majority of people want their job to be easy to do. The same way that someone running a restaurant doesnt want to deal with a picky customer, the same way that a mechanic wants to work on a nice car with a few easily identifiable problems, etc.. Doctors also just want peoples issues to be quick and easy for them. Most dont like dealing with complicated people who they dont know how to help quickly. Often they will make a quick fix solution to your problems even when it does nothing to help you holistically and can make other things worse.

Ive seen a lot of doctors and the vast majority strike me as people who went into it for the money. There are a few genuinely good doctors who want to help people first and foremost but a ton of them just want easy patients and a nice paycheck