Stephan Pickering is reported to have been banned from more Internet sites than any other living person. If you are considering banning him you could look at some of his posts and comments to get a sense of what he does to offend so many people.
Traveling Troubadour (On Charles Darwin)
Traveling Troubadour (On Lying Fraud)
Viciously upsetting family and friends with delusional lies when someone dies
Suze Rotolo (On Smoke)
If you would like similar discussions from other groups just ask, state whether you want another 4, 40 or 400. Admins from many sites are happy to advise you on dealing with offensive destruction of your site and unprovoked harassment of random people.