I'm sure Avebury has a plethora of material just to push buttons, as he has said, that's what he gets off on. This would not necessarily be a bad thing if in fact he/she were raising specific points and/or perspectives that could validate and support whatever his/her position is. Unfortunately that doesn't seem to be the intent. As nothing of any sense or relevance is offered in rebuttal other than insults and accusations and complaints about others, it's clear the sole purpose is simply to stir the pot and create as much discontent as possible. On that note Avebury I commend you for doing an excellent job albeit counter productive. As for the specified thread proposed by Purps, I doubt it would do any good and even if it were used I know it's not the type of energy she wants on this site.
I basically see two options: 1) the obvious which is say good bye to Avebury, or 2) Ignore him, If the button pushing doesn't get the desired result, it likely won't last.
Though #1 may be desirably for some, I would reserve that as a last resort in that we have for some time been able to carry on conversations with opposing perspectives and both sides hopefully have grown and learned. Not always, but the banter can be done with respect and humor and if necessary agree to disagree. I sincerely hope we can continue this practice.