The way I see it, if you get that frustrated with programming, then you're in the wrong industry. In such a situation, all I see is someone who is not happy with the job they're in. Everybody has their bad days where nothing works quite the way you want it; those days where you sit there all day working out one tiny problem that should have been solved within 10 minutes. It becomes a problem when each day turns into this situation: not only will the boss and co-workers not like it, chances are you're beating yourself over the head for it to (whether you are aware of it or not).

On a second note, when was the last time this co-worker of yours got to take holidays? Maybe he needs some time off to do something other than programming. Breaks are necessary! If he's recently had holidays, then the only thing I'll point at is that he is burnt out. Or he is unhappy with his job. Or his life is too stressful and he's taking out his stress at work -- also while increasing stress levels.

Me... I just don't let it get to me becuase there is nothing there to get at me. I love programming; it has it's frustrating moments, but it is fun to learn from them. Do I sound crazy? ;)