Sometimes, it takes one or two people who are willing to break the tradition and speak kindly to those on the "untouchable level" to start the changes rolling. These types of behaviors are often based on fear that if you don't treat them like crap, peoplewill mistake you for them (not you personally, but the general, unknown "you") I ran into that at a clinic I worked at once) Stopping and snacking with the security guys and the office staff slowly started to change the atmosphere, but it took time.