Don't tell him to "stick his job"! There's 20 people waiting for that job, and less jobs out there for you to find. That's the way of the world right now, a good job is hard to find.

Look the fact is some days bosses are idiots but then so are employees. Instead of being upset over this, why not go to this person when everyone is cooled down and ask what the proper procedure or expectation is for helping another department? Everyone these days is so touchy, where'd communication skills go?