As in most fields, there is a distinct rank of authority in medicine, and at the very bottom of the totem pole, is the med student. You could argue that pre-meds are the very bottom of the totem pole, but they have more of an observational role, so they don't really count in that sense.
As third year medical students in the hospital, it is quite obvious that we are the "nobodies" of the team, especially early on in the year, when we don't know much about how the hospital works, or the politics of the team, or even how to do simple tasks. Trust me, I'm totally fine with the pecking order. I know my place! But something that I find a little frustrating is how the more senior members of the team don't help you out in the least, they just stare as you awkwardly flounder. I'm not asking for anyone to hold my hand, but it'd be nice if they could just think back to what it was like to be a medical student, not knowing anything, and be a little more direct with how things are supposed to run. Seriously though - MS3's are not mind readers! If we were, we wouldn't have gone into medicine, we'd be sipping champagne and laughing on our yaughts we bought with all our lottery/stock-market-won riches.
I will say that there are some interns, residents and attendings who do remember what it was like to be a medical student. They give you little hints and nudges, and those few moments they donate of their precious time help us out tremendously. However, I have met several residents who obviously have absolutely no recollection of what being an MS3 is like. They just assume you know what they know at their current state of training, and look at you like an idiot when you ask them how to do things - all the while being annoyed that you exist.
I'll admit, it's easy to fall into this trap. I'm thinking of a time I was shadowing as an MS1. That day, there happened to be an undergrad shadowing too. I think I was annoyed because I knew the attention of the attending wouldn't be solely on me that day. I mean, was this undergrad even smart enough to get into med school? Anyway, I found myself getting irritated with the undergrad throughout the day, especially because I kinda got stuck baby-sitting her. Later, I thought back to my experiences as an undergrad, and how nobody in the hospital cared you existed. I remember how surprised I was when I realized what a difference it made in the way people treated you when you moved from being a pre-med to being a medical student. In retrospect, I feel terribly guilty for being irritable towards the undergrad. Afterall, that was me just a few years before! I hope that when I move on to residency, I learn from my previous mistake, and from the mistake I see a lot of residents making. I hope that I am the helpful, enthusiastic resident, who the med students go to for things that come up. Yeah, it takes more effort to be that resident, but the med students will be so much better for it. And isn't that what training to be a doctor is all about? Providing more compassionate and competent future doctors?!