There is no doubt that a lot of problems with safety today come from Egos, and Arrogance. TV, and movies have just as much an adverse effect on shooting safety and shooting skills today as they did back in the 1950s. I don't think its worse now, than it was back then.
I teach people of all ages to shoot handguns for self defense, and I find the same kind of things show up periodically with new students as you have mentioned. I let the student miss the target, and then ask the Dr. Phil, question: " How's that working for you???"
On only one occasion, when I was trying to teach another lawyer to shoot, and he just could not put his ego aside and listen, or watch, I put up a second target, let him shoot first, and then proceeded to shoot a very small group with a similar revolver at a similar range. We barely had enough evidence to count all 6 holes. He was impressed. I simply said, " This is why you are the student, and I am your instructor. Now, will you listen to me and take my advice, rather than try everything your own way? "
Later, I showed him different shooting styles and had him try all of them. I then told him that it was up to him to pick what felt the most comfortable to HIM. He expressed shock. He actually said," I thought you said I was to listen and follow what you told me to DO??" I told him that I had just shown him 3 different shooting techniques he could use. I had showed him how one of them works better in some situations, and the others have their merits in different situations. He needed to know all the techniques, so he could adopt the best for the situation he was in, and do it without hesitation, for any reason.
I then noted, " Notice I have not told you to use that cockamanie form that you came here with. Outside of a couple of feet, its inaccurate, and you won't hit anything. I will show you even better and faster forms to use when you are belly to belly with someone who is trying to kill you."
And I did, after he mastered some of the basics, first.
I think you gave your friend, the Range officer good advice when you stopped him from showing the man what he was doing wrong. An R.O. is generally not an instructor, unless there is only one shooter on the range. The guys that come to a public range and shoot handguns sideways deserve to waste ammo. Its actually a small price for them to learn how ineffective this technique, which seems to infest most movies, and now most TV scripts, is. We are a long way past "The Magnificent Seven" where James Coburn went into a Turret stance to shoot a bad guy off a horse at considerable distance with his Colt .45 Peacemaker.