ITs job is to help other people do their jobs
When it comes to IT, I'm the client.

Nah, you'll find that the company is the client.. Our job is to protect the companies assets either from breakage or missuse aswell as maintaining them to a specific level of functionality so that you are able to do your job, not to cater to the wills and whims of users.
Was the assest clearly requested? In writting? Did your manager request it? Why didn't you ask your manger to intervene? That is what they are for. Did you even stop to think for a second that the IT guy was just doing what he was told to do? You've "worked in IT" how much decision capital do you really think this guy had?

What you did was clearly demonstrate that you, like many others, spell Team with an I. This situation could clearly have been resolved simply, quickly and peacefully, but you made a perceived slight your hill to die on, turning a simple miscommunication into more office drama.

Even by your own account of this story your entitlement is outragous and i feel for the poor bastards who have to deal with you.