1) I suspect they complain just as much about premeds as we complain about them. As a rule, premeds are some of the most arrogant, self-involved people in the world. We're all really type A-ish too (whether we want to admit to it or not, plenty of people are always arguing about how "chill" they are) because our grades have to be good. In general, look around SDN. We're those kids sitting in the front row who ask for extra points on the test, or the kids in the back pretending not to give a damn while taking mental notes of how to argue for extra points, and smugly making fun of the ones that try really hard. We're, as a rule, insufferable.
2) Now that I'm in med school, I often come across RNs who are getting their NP degree. I think there's a little bit of inherent awkwardness to the interaction, but for the most part as long as we (as pre-clinical med students) acknowledge that they know way more about the daily clinical management of a patient than we do, everything is ok. As a woman, it semi-bugs me when I see the female nursing students hitting on the guys in our class because they're going to be doctors, but hey, to each his own I guess. I'd rather be one than marry one, but we all make our choices.
3) One thing that REALLY bugs me about people on this site is how everyone is always whipping out their e-peen and bragging, especially the math/physics/engineering majors. Oh, I majored in engineering and you majored in english, I'm smart and you're not, neener neener. Dear engineering majors: as someone who has now edited a zillion of your personal statements and secondary essays, I have a very strong suspicion that most of you would have FAILED as english majors, philosophy majors, or really any major that requires the ability to communicate through the written word. Y'all are the first ones to compare your 3.2 engineering gpa to some kid's 4.0 in spanish, and meanwhile you can barely speak one language, much less 2. Being good in some of the higher-level psychology classes requires understanding the way people think, and that requires social skills and social intelligence, which MANY uber-macho physics and math majors are sorely lacking. And the idea that a class in which you have to "just memorize" a bunch of information is inherently easy is HILARIOUS...because you have described med school in a nutshell, and I haven't met too many engineers complaining about how easy med school is. So please spare us the bs. If you had been really really good at something other than engineering, you likely would have done that. If you picked it, it generally means that's where your strength lies- which means you probably wouldn't have done as well in other stuff. Are 4.0s created equal? Of course not. But I am so sick of seeing the "subtle" judgment against liberal arts or natural science folks implying you had it oh-so-much-harder. If you knew that you could have gotten a 4.0 in english/philosophy/whatever and that you would do poorly in engineering and still picked it, that was dumb. Maybe you're not as smart as you think you are.
/rant.
Incidentally, I know plenty of engineers and math/physics majors who can complain about their lot without trying to bring everyone down with them, so it can be done. Just stop being so darn smug, guys. Maybe that's why the nurses don't like us in the first place.