It predates the BOFH a bit as well. I am restoring a PDP-10 to operation and the operating system refers to users as "lusers", non-sanctioned users of the system are "turists" who were just there to gawk at things. It's not so much out of disdain for the people themselves as what they were doing with the computer - when computer resources were limited, it was grating to have to wait while unskilled and uncaring people occupied those resources for frivolous or unnecessary reasons.

Edit: Consider being told something along the lines of "Your DNA sequence has to wait, the CEO has important Facebook posts to read..."