Read this very thread and you'll see why IT get treated badly. It is a fallacy to expect people to be able to understand computers as well as computer enthusiasts. It is the same reason why IT isn't asked what the balance sheet liabilities are. I mean it is bloody obvious and written down in front of them, so why can't you get your head around IT asset depreciation curves?
I'd say IT is one of the worst for the peter principle too.
Phoning up IT because your PC isnt plugged in and you didnt check is a bit different...
Or phoning them up to do non-IT related jobs, like move furniture around just because a desk happens to have a PC on it. Then kick off when told to get lost.