Here's my take(and I am an NRA cerified RSO):
Yes, you screwed up 2 ways:
1. Handling the gun(for any reason) during a cease fire.
2. Going over the line to the bench.
HOWEVER: IMNSHO the range officer in question handled it very badly if it started out like that and got as ugly as you said. I don't really know all the details, so I won't armchair QB it.
It is sad we have to be so strict, but you have to remember:
Someone at the range could possibly have 0 experience so we have to run it safely for the lowest common denominator.
From my cold dead hands.........
NRA certified rifle, pistol and shotgun instructor.
Hunter education instructor