He's just a troll/internet tough guy having verbal warfare via Twitter and IRC.
Xerxes: http://th3j35t3r.wordpress.com/2010/12/09/time-to-speak-up-p...
He's actually laid another ultimatum (for the umpteenth time in the last 3 months) promising revenge. His first act seems to be that irc.lulzco.org is down. We shall see if anything else comes from his indignation.