Some of them take their job too seriously, as if they're the armed response or as if you're the most dangerous person in the world.Sounds like the standard power tripping security bell end.
We got caught in the social club the other year and the security guard was some jumped up keen knob head who took his job way too seriously. The key holder who was with him told him to pipe down and just told us to fuck off, which we did.
Others are actually decent people.