It sounds like he is depressed about finding work and struggling to make the transition from study to full time employment. I get this notion because you mentioned that he will only apply for work at high-end restaurants, which suggests to me that he is uncomfortable with the reality of starting out in a career and would be easily bummed out by having to start out in a lowly job. This may be compounded by the fact that you have gotten a job already and are college educated.

I would suggest a non-accusatory approach with regard to finding work. One question i always hated being asked is 'when will you find a job?'. Instead maybe ask, what you can do to help him find a job, and what concerns he has, etc.

Let me know what happens from here, I'm curious.

T.