Hey paperumbrella, I share your world view that most people are basically good and internship hasn't changed that. Oddly enough, it's not the drug dealers, rapists, borderlines, or crazies that inspire my hatred/rage, it's the people I think are abusing the system (at others' expense) or patients who feel entitled.
In the first group, their character flaws and mistakes in life are not my problem as long as I can interact with them effectively. If a pt's behavior is difficult to handle, think of strategies to manage it. As you know, you can't fix their pathology, though you can fix their etoh w/d, aspiration pna, endocarditis, etc, even if they're extremely unpleasant while you're doing it. These patients present some negotiation challenges but they don't get me down.
However, the ones I want to throw out the window are people who know how to work the system or who think they're more special than the guy in the next bed for whatever reason. For example, the 37 y/o woman with past kidney transplant admitted by a private doc for a URI (2nd cousin to one of the transplant surgeons!!), who first tells me that she wants a certain dinner at a certain time, and when I ask about allergies tells me things like "well, I tried PCN once and I just didn't feel right, and I got a Z pack once and it made my left leg tingle, and when I take tylenol I get dizzy and ....". Then pt and family demand daily meetings for updates at particular times. Grrrr!!! (I made a point for the rest of the admission not to spend any more time with them than I did with this little old lady across the hall who never really complained about anything.)