In my experience I've found that most people that shoot are "know it alls" when it comes to guns. I even saw a range/shop employee loading his Glock during a "cease fire". As a firearms instructor, I try to keep an open mind when others give advice. I'm surprised at the amount of things I can still learn even after all these years. I guess that's why I keep coming here.
I like seeing responsible people teaching and encouraging new shooters. It's the irresponsible ones you got to watch out for.
"The only thing you can assume about a broken down old man is that he's a survivor." -- Joseph Sarno "The Way of the Gun"