It's a tough balancing act ... trying to be pro-active, prevent serious accidents/injuries, while educating, but to be firm yet not too over-the-top authoritarian. I couldn't do the commercial range thing; my head would explode or I'd choke out the first stupid person I encountered, and there's certainly never a shortage of stupid shooters at any commercial range and even some long-standing private gun clubs.
I run ranges with some experienced shooters, sometimes mixed in with junior personnel, sometimes strictly tactical team guys, and even then, there occurs the whoops! moments, the total brain-farts, the occasionally lapse of situational awareness/attention and ... every so often, a incident of plain stupidity or negligence. What really scares me is when an officer reaches the point where he/she feels they know everything and therefore they don't need supervision.
What most people can't stand are the "Range Nazis," those ROs/RSOs/RMs who treat every single person on the line as though they are morons requiring total micro-management of every single action and range command. And I've seen a few of those in my day.
But, there are those who are blessed with the ability to gently, yet firmly correct a shooter who has a momentary lapse and still make a lasting impression; those are the folks we need -- the kind we (more experienced shooters) don't even notice unless something really bad happens.
As far as having food or water on the line, there's evidence-based research indicating this is not a good thing. But, as an adult, make your own choices. Just get your lead levels checked every few years, especially if you frequent indoor ranges.