It's a tough call. but for this particular case I beleive that we have to send a message loud and clear.
By ignoring this, he might do worse and worse. As mhking said, they tried ignoring him Didn't work.
Show me a thread where a disrupter is ignored and I'll give $50.00 to your favorite charity. Most even have people pinged to them. Ignoring a disruptro is never done on this site.