Not drywall, but a similar situation with another trade:
During a cinema install, I was going to place the emitters for the assisted listening directly below the observation ports, that would allow me to mount them from the projection room instead of dragging an extension ladder all over. There were 8 of them to install.
The port design (which I objected to but couldn't get changed out) had the glass permanently sealed in the frames. I had coordinated with the GC and the glass contractor to make sure I would have my emitters installed before the glass went in. We all agreed on the idea that I would install my emitters right after lunch, staying just ahead of the glass install. I went about my other work that morning then went to lunch.
When I got back from lunch..ALL the glass was in!! I found the GC and asked him what was up..he had no clue and repeated what he thought was the plan as we'd agreed. He called the glass guy and was told, using language not suitable for this forum, that too bad deal with it. I told the GC to ask the glass guy to come back the next morning to remove the glass so I could proceed, and the guy could re-install the glass right behind me. More abusive language followed. I told the GC I would deal with it my way.
Out came my hammer and eight observation ports bit the dust.
I installed my emitters and gave the GC my card to send me a bill for the replacement glass.
I never did get billed, and that glass guy never worked for the GC again. (A huge loss as he was also responsible for the lobby walls, etc. so major money involved.) I did however work for the GC again.
I would not have taken such drastic action if the glass guy had acted in a mature and reasonable manner and we had come to a date/time to do the work.