I welcome a few pointers and some friendly advice, we can all learn a little bit from someone else's point of view, but it does occationally get out of hand, and not just with shooting.
Once, I've been to a range and knew I had an expert present. I asked him for pointers, asking several times if I was bothering him and should go. He was extremely helpful and very generous with his time and advice.
When we got to the range, there was a sign up on the shooting benches and a guy sitting at a bench with a field scope and a radio. While we were walking to the range, we heard a rifle report, but the only guy on the bench didn't have a gun.
The sign read "Sniper in the field, no firing please" We sat at the line for a few minutes while the sniper and spotter took a few more shots, the the spotter told the sniper, "There are some others shooters here, time for a break" and the guy stands up in full gaille and walks back to the shooting benches.
USMC Scout Sniper visiting his spotter's family in the area while on leave and they decided to take the day and get some practice in. Was a great day at the range with some great company. I was more worried that we were bothering them than them bothering us.