Your assumption about my training isn't right, I'm a qualified mental health practitioner, but haven't worked in the field for a good few years.
NDP - is a fairly full on condition and shouldn't be used to lable merely bad behaviour, it's a clinical dianosis. Like most mental health dissorders can be self diagnosed/pushed onto someone erroniously.... Depression, real depression is a clinical illeness, not simply feeling blue one day.
Just because someone has a grossly differnet style to others, is really annoying and up his own backside - doesn't not a mental helath condition make.
and of course I take thing or leave them
PS: I do think that doing some ham cognative behavioural therapy, when it has neither been prescribed or asked for is deeply manipulative and morally iffy. It fills some savour complex/super hero. The most appropriate in a turel mixed organisation is to find ways to make low % MBTI types thrive in their work. He is adding a lot of value - he sound frustrated (probably dominance of SJ/non creative/talented).... stand in his shoes - what doe the world look like...