bigot

bigot n.  A person who is religiously attached to a
   particular computer, language, operating system, editor, or other
   tool (see {religious issues}).  Usually found with a specifier;
   thus, `cray bigot', `ITS bigot', `APL bigot', `VMS bigot',
   `Berkeley bigot'.  Real bigots can be distinguished from mere
   partisans or zealots by the fact that they refuse to learn
   alternatives even when the march of time and/or technology is
   threatening to obsolete the favored tool.  It is truly said "You
   can tell a bigot, but you can't tell him much."  Compare
   {weenie}.