I guess I am looking at this from a beginner/recent beginner perspective, as an adult learner.
Ok, there are SO MANY horse people who think it must be THEIR WAY or it's WRONG/BAD/RUINING THE HORSE. Just think of the controversy that giving treats dredges up! Or clicker training! Or any of the random horse trainers. O_O
I honestly don't give a rats arse the *who* I'm learning from, as long as it WORKS, and isn't too much effort for too little return on investment. I'm not going to go out and spend all my money on horsemanship videos from some random guy, just because what he says is the "BESTEST WAY". I may read up, I may watch a few videos to see exactly what is going on...and dammit, if I'm having problems, I ASK. God knows that sometimes I sound like a total idiot on this forum, but I'd rather ask the question than screw up my horses! =)
Also, if it wasn't clear from my first statement, I've found that there are many of these "horse elders" (whether they in fact ARE elders or just *think they are* haha) can be very condescending. Before I got my first horse, I was told that I"d ruin her, that she was ugly and would only be good for meat. Um, do people know exactly how they come off as, by saying that? Do you think anyone really wants to listen to you, after that, or learn from anything you have to say? And I've seen people put their feet in their mouth this way over and over again, almost as if they were somehow enjoying being the keeper of all that is right in the horse world lol.
AS others have said, people may be at a different place in their (horsemanship) journey, but we are all still learning, and it is indeed best to try to keep an open mind. =)