The reason I asked this question is that a few of my classmates (who do not seem to fall in the 'i know everything' type) have been barked at or excluded from teaching opportunities.

I have also seen some VERY bitter nurses. They've put up with me as part of their responsibility (they need to supervise, etc) but i'm suprised at their attitude. I dont' think that this is just in my mid-sized teaching hospitals in the area. (by the way I'm in Ontario, Canada, perhaps this makes a difference?)