Too harsh? Depends on the intentions of the poster. I've read about this issue before, and it seems to boil down to whether the person has a serious illness and where their intentions lie.
But this ren guy strikes me as a game player, one who likes to fuck around on forums while snickering behind his keyboard. Likely, he just got bored, or maybe some of avi's psychological insights hit a little too close to home. I get the vibe that he's one of those hit-and-run type of trolls who takes off when they're on the verge of being outed.
If you do a search on his email address, you'll come up with all sorts of weird stuff posted in brief spurts on forums, usually in brief spurts.