As I said above, 
My personal views on the subject are that he's quite the idiot, and I'd like to say so.  My views on the general question are that we need to present all articles in ways with which both supporters and opponents can agree, i.e. a neutral point of view, and this necessarily excludes the use of derogatory language, which (as I already noted) the discussion concluded "conspiracy theorist" to be in this context, and which would definitely include the way I'd like to describe him.