Although I have met many very "nice" premeds, I have also come across the arrogant, cut-throat jerks.
In a lab where I am doing research there was a pre-med whose father was good friends with the prof...hence the incredible opportunities that opened themselves up for this youngster...that being said, he was very intelligent and I respected that. But he was such a jerk!! He would walk out of the room when I was in mid-sentence or even just turn around and start talking to someone more "important" while I was asking him something.
On once occasion, I was in the building with my children. I was looking for a pen in one of the many un-labeled lab drawers and I found a bag of gummiworms. I took three single worms out for my kids and on Monday I asked in the lab who the worms belonged to...they were his. I explained that I had borrowed three and gave him $1 to buy new 2 full new bags for himself....they were the 2 for 1$ ones...and this guy got his nose so out of joint that he went to the professor and reported that I had stolen from him...and I had to sit through a lecture then by the prof.
He is an MS1 now, by the way....
Kris