Our range has no rule for racking guns during cold range, but it does require all guns to be made safe with a flag in the chamber. And there's a yellow line painted behind the shooting benches, and nobody can step over it towards their bench while people are downrange.
It doesn't happen very often, but on one occasion the range was called cold, and a flashing red light was turned on while we went to retrieve targets. I happened to look back and a guy was at his bench and appeared to be cleaning his rifle? Since it lined up with the guy who was setting a new target next to me I asked him if he knew the guy, and he said, "Oh, he's just cleaning his gun. It's not loaded."
I told him the rules are posted right at the line, and doesn't matter if the gun is even on the bench, you can't touch anything at the line during a cold line. He got an attitude, and I walked back to the line and told the guy there the rule, and showed him the signs. The member who I spoke to got pissy and began giving me attitude, so I walked over and looked at his badge number, and told him I was done talking, and would pass this along to the club officers. He got worried then, and began to be nice, and apologized, but I told him I was still passing his badge number along.
The club called him in front of the Board at the next board meeting, and suspended him from the club for 30 days, plus told him he couldn't bring guests for the next year. They also reprimanded him for having 5 guests, instead of the maximum 3 guests, and not keeping his guests under control. I got a call later telling me what they had decided, and how they handled this situation.
I would never get mad or fight with someone while we all have firearms. Best to try to warn them, and remind them of the rules. Then report it if they wont change what they're doing.