DESERTBOB (not its real name) is a troll.
It regularly frequents at least twenty news groups,
including many rabid/sex/racist/liberal idiot/wannabee mechanic
groups.
Normally, it starts off with reasonable, even witty lines,
but rapidly drifts into lies, abuse and stupidity.
Check its details at Google Groups at this URL:

http://groups.google.com/groups/prof...Te82ZIng&hl=en

See it's pathetic picture and myspace page at this URL- as it searches
for companionship at age 50- looks like a quart of oil for the car in
that hair...

http://profile.myspace.com/index.cfm...did=303 21125

It had 2 Ebay usernames, both banned due to abuse, auction
interference, and harassment- they were VOXPOPPER and XCALIBER44- see
them here- search history of VOXPOPPER to see how it left (8) negative
feedbacks for a seller, for items that cost only a penny each !

http://feedback.ebay.com/ws/eBayISAP...erid=voxpopper

http://feedback.ebay.com/ws/eBayISAP...rid=xcaliber44


It is a sad creature, deserving of pity, not anger.
Any direct response simply feeds it,
but it will go away if you ignore it.