Schizoid Nurse... Oxymoron?

I was having a conversation with a classmate of mine about Schizoid Personality Disorder which she has. (dxed and txed) Now, I understand the disorder to be someone who is pretty much a "loner" not because they don't know how to interact socially, but just choose not to. She says that she really doesn't feel much emotion for people or really care to have friends or even relationships. She said that she can't tolerate most people and feels that the world needs to "grow up". She also talked about touchy subjects like "population control" and putting massive doses of Chlorine in the Gene Pool and how she really can't stand how weak and pathetic most humans are. It was interesting though because as we were talking about, the way she came across didn't present itself as being "angry" but almost as if she couldn't really care less about anyone or anything. I understand that some of the things she said were meant to be humor, but almost in a way to say, "ishkabibble".

We didn't get into an argument, but I did ask her if she had such misanthropic views about the world and other people (which she also mentioned), why did she want to be a nurse. We talked about it for a while but she couldn't even come up with a good reason. She said it baffled herself at times too, but despite all those negative feelings she just has an inherent drive to take care of people even though she generally doesn't like most people.

I'm confused. Can someone help me wrap my head around this? Perhaps someone could better explain what being a Schizoid really is, I don't think I understand it correctly and perhaps why you think she would want to be a nurse even though she really can't tolerate "stupid" people as she calls them. To me she is a walking paradox. And what's even more confusing to me is that I really really think that she is going to be an AWESOME nurse. I can see that just from watching her in clinicals. She is very professional and does her job well and helps others when they need help w/o even asking. She KNOWS her stuff to a T and has even impressed our instructors on a number of ocassions (who happen to be Nurse Ratchcet I and II imho)... the only thing is she is almost TOO professional and cold. I joked with her that she would make a good doctor haha, she just gave me a look like she was going to eat my soul so I just shut up and continued with my butt wiping.