Do Less

I had to work lunch shift with "Mr. Sarcasm" for the first time yesterday.  I don't think I've met a more do less person in my life.  He spent the entire hour complaining about his demotion.  He's actively seeking other employment but he can't keep his mouth shut during interviews.  He uses sarcasm when answering potential employer questions.  Is this man stupid or just a masochist?  He wants to leave and we all want to see him gone as well.