I think there's some middle ground between being taken off the hrose without an explanation and "being praised to the high heavens". My guess is that she wasn't praised to the high heavens on a daily basis, nor requiring it as a daily feed to keep her coming back. But, I can understand completely feeling belittled by this experience.
However, it really is a matter of asking why you were taken off. I bet in part it was due to the instructor not wanting the horse to be allowed to carry on with this bad behavior. Lesson hroses have to be kept sharp, and for that, a sharp rider needs to be on them. You probably just have to face the facts that you have a ways to go before you'd be that sharp rider.
In any case, yeah, you need to ask for the truth, accept it and move on.