Some people are unable to control their emotions in stressful situations. You can't really know if someone is outraged by you questioning their authority or by the fact that you clearly don't want to hear the truth. Or by their inability to counter other doctors who woo patients with sweet talk, although obviously doing poor medical job.

Some people can't suppress bad habits like using buzzwords. Maybe they have been taught to use them, maybe they are just too good at what they do to need worry about convincing you. Some people are great actors, and will make you believe they are truly passionate about their job. This is what I am talking about: https://medium.com/incerto/surgeons-should-notlook-like-surg...