Raider 1;These people do have an unenviable job, especially when they have to explain to some semi-irate pax that they have to put their nail file/clippers in the bin and no they won't get them back. I know I'd get a little abrupt if I had someone making what could be construed as a smart arsed remark, especially if I got it several dozen times a day.
Give them the benefit of the doubt. Not every security person graduated from the Heinrich Muller school of public relations