It sounds like you are referring to Chris Costa, and it also sounds like you don't understand what he was doing. By his yelling, at certain people while they were trying to perform drills, he was breaking their OODA loop and forcing them to try and work through it (that is the way it appears to me). You need thicker skin if someone yelling hurts your feelings. No they are not doing this just to make it seem like boot camp. There are valid training reasons why such surprise actions can be beneficial. Just imagine how you might react in a real defense situation. The actions of an attacker, sudden surprise attack, etc are more than enough to screw with most people's OODA loop, and I would say there are lots of people out there that would just plain freeze up (at least momentarily) in a situation like that. "Casual" range training with no real uncomfortable stimulation like that really doesn't fully prepare someone for how to react. Having someone yell uncomfortably loud at you like that, taking you by surprise, can be a useful training tool to teach you to work through it, focus on the task at hand, and get back in the fight.Have you guys seen the Magpul DVD? One of those guys comes across as a serious AHOLE...the last thing I want is some jackass yelling in my face if I'm paying you good money.
Now with that said, if I can get my new AR secured by then, then you can count me in.