When I was in the pits on Thursday, and I admit standing in the way in the aisle, a student did say - politely and not too loudly - "watch out, robot coming through". This is the way it should be done, to alert people like me who are legitimately in the way. (But I was wearing a B&W striped shirt and students are more nicer to me when I do
)
In general I think FIRST people are more polite on the whole than the general public. I've been at many events where the staff remarked how the students are better behaved than at other events - most recently at Temple for the MAR Champs. But, as mentioned already, this is indicative of society in general which is ruder and more egotistic than in the past - do you ever read blogs other than CD? The attitudes and language are appalling.
But maybe I'm just a cranky old woman.