Still contemplating sending a modified version of that rant about the shitty instructor to the Coop GM. Not sure what purpose it would serve. The last thing I want is for someone to lose their job. Not that they would can him over one complaint. Then again, if they have had others maybe he deserves to be canned?
Don't modify it, just send it, along with a link to this thread. The guy was a douche. A ski school manager at most areas would comp you a lesson, probably with one of their better instructors. Other than in his own mind I doubt this guy was. Ask for a level III or IV.
Be open with what you are looking for from a lesson with your next instructor. Be very specific with what you want to achieve. If the next instructor is any good it will allow you to have a lesson custom fit to your needs, which is the whole point of a private.