What you describe is a fallacy... it's more like: "I'm a heavy machinery operator, not a welder; if you need a weld, you'll need to requisition a welder."
The next day I was in his office when we got a nice visit from the Teamsters steward flanked literally by two huge guys glaring at us. The steward told us not to do it again. He did back off when we told him we walked the computers between the buildings - if we would have drove them between buildings he said they would have filed a union grievance.