I hate rude people with bad manners....
Can you start training at the new location and slowly move your customers to it a little over time?
This is a tough one, but if I were a volunteer and treated that way I don't think I'd be back.
Why do you suppose they put up with it?
I'm hoping that's what I can do. I'm not sure whether they have suitable lesson horses or whether they would be willing to use them as lesson horses, so I may have to wait to take new students until I find a horse to lease or buy. I'd like to sit down and talk to them about the level of professionalism that I want for my business, and that my current facility is not conducive to my student's learning. Then, if I can start there, I may just tell my current BO that I need more than a round pen for my lessons, thank you for your hospitality, but I'm going to start teaching there so that I have access to both an arena and a round pen. I think it can be as simple as that, she doesn't necessarily need to know that I disagree with her horsemanship. Then, I will only take new students at the new facility, and finish up with pre-paid lessons at the old facility.
I really think the volunteers just don't know any better. They treat her like a goddess of equine omniscience. I'm not incredibly experienced, and I'm not a horse trainer, but I know that beating a horse into submission is just flat out wrong. The volunteers don't know any different, and they think "Oh, I guess that's just what you have to do then" According to the way she talks about 'good riders' the rougher you are, the better rider you are. Especially if you can make the horse freak out and then calm it back down, you must be a great rider.
They are proud that they 'get' to work with her, so they put up with anything. Plus, there aren't many other places to go.