Call me a bleeding heart killjoy if you must, but I've recently come to the conclusion that just like prison rape and developmental disabilities, mental illness just isn't something you can make tasteful jokes about.
If you read his comments there's something definitely wrong with him (I hesitate using that phrase, but I don't know how else to say it). He's a talented individual with a strong work ethic, hopefully he gets the help that he needs.
You're hesitant to use the phrase "something definitely wrong with him". That made me think of other terms, like "disturbed", "unhinged", "unbalanced" or the clinical "mentally ill" and I can't find anything that doesn't sound demeaning, judgmental, or moralistic. I think that says something about our ability to understand and help these people.