The limited information mostly points to a person under extreme duress and clearly offended by his management. How is it not a personal attack to conjecture in public about mental illness? Because it's apparently unintended as a personal attack? Hmmm, I'll just swing this club around in a crowded room, hope I don't accidentally hit someone.

In these circumstances questioning mental stability essentially questions a persons entire ability to reason and reasonably rationalize.

Is it that under duress and in a perfect storm of personality conflict, someone must be mentally ill to break down or behave in a way that appears irrational? I guess it could be, and damn, if someone doesn't agree with me, that's a pretty good sign too ;-)