Maybe he is just growing up and realizing that unicorns do not poop rainbows and that in general, real (adult) life sucks.

What I mean is: responsibility, responsibility, responsibilty... who WANTS that anyway.

Maybe he's not altogether happy about moving out, maybe he's just transitioning.

Just because he seems negative doesn't mean he's depressed, and if he is depressed, doesn't mean you did anything wrong.

Just trying to offer an objective opinion without running rampant through the psychiatric route first.

Idk what you mean by his T being judgmental, sometimes people who are blunt and straightforward, come across this way.
Maybe the T is the latter and your son respects that? or maybe he is actually judgemental, either way your son doesn't seem to mind his method or manner.

Essentially its really about whether the T and patient are compatable, and not about parental approval.

I do hope he gets out of this funk soon and finds some direction.