LOL@ the "Hostile work environment" comment.
No, that's called "Not being able to do the fucking job, and your boss is sick of your bullshit excuses why."
What I find really hilarious is that he admitted he was incapable of doing the job, yet somehow expected his supervisor to accept his excuses for why not. Maybe he can't multi-task, or maybe he's shit at prioritizing and time management. Maybe he just slacks the fuck off because he's lazy, and fails to get things done. Whatever the reason, it sounds like he whined about how haaaard it all was and expected to be taken seriously.
And of course, he had to walk off the job. He didn't choose to; he had to. Totally not his fault, guys. Right.