I, like Phd1, am chiming in a month late, according to the post date of the last comment. I don't think Phd1 meant to seem egotistical. Personally, out of the many docs I work with, have been treated by, and have known personally, 75% acted rudely or showed arrogance on a mostly regular basis. [again that has been my experience in my part of the world.] Anyway, to me at least, what Phd1 was implying was that no one with a medical degree or any other degree should feel like they have completed the single hardest degree/ career path there is. Now just because a person shouldn't it doesn't mean they will. The world is very well aware that become a physician is no easy task by any means, but neither is becoming a Physicist, Chemical and Aerospace Engineer (or any kind of engineer for that matter; think of the people who have to build the machinery a physician or surgeon must use in order to do a procedure), Chemist, Architects, and many others. Shoot, a Master of Arts Degree in English could be hard for a Mathematician or Physician who primarily does well in advanced math and hard core sciences.
Now, I'm not saying that one major/ profession is the hardest, but most professions and college majors have the potential to be hard. MD have conquered an amazing course to become physician, and sometimes I feel that they realize this and let it go to there heads, just as anyone can. I feel that Phd1 was trying to say that people, in this particular setting they are referring to future physicians, should realize that they are not the only ones that have the capability of completing something extremely difficult and be something amazing and that a medical degree doesn't mean you walk around like you know everything, nor can anyone else for that matter Physicians, PsyDs, PharmD, DNPs, PhD etc.....
Same applies to why X-ray techs act arrogant, why Nurses act arrogant, and why EMTs act arrogant. To many people it just seem to be more prevalent with physicians, not that this is always correct.