The forums here aren't too bad mostly, so really if you have an issue with someone please just ignore them/their posts - don't respond to them and report any posts you have an issue with (this doesn't mean report EVERY post that person makes, unless they are all toxic...) and message a moderator if you really feel he's causing an issue.
It does seem as though his posts have a grating effect on a lot of people, so I'm sure this will be resolved quickly if people do as they are supposed to.