flamer

from Jargon File (4.4.4, 14 Aug 2003)

flamer
 n.

   [common] One who habitually {flame}s. Said esp. of obnoxious {Usenet}
   personalities.

from The Free On-line Dictionary of Computing (8 July 2008)

flamer
pain in the net

   <jargon, person> (Or "pain in the net") One who habitually
   {flames}.  Said especially of obnoxious {Usenet}
   personalities.

   [{Jargon File}]

   (1996-08-26)