You sound an awful lot like me in the way you think about your child. I, too, have a little guy who is super-loving and super-sensitive, but at the same time, is a total brut, a bull in a china shop, if you will, and can be extremely energetic to the point of exhaustion (mine! - lol)... so I definitely get where you're coming from.
I also have experience with instructors without a clue about how to relate to or instruct young children. Our local YMCA is notorious for hiring teenagers to teach gymnastics, swimming, etc., and they are typically not well equipped for teaching. And I get totally frustrated for the same reasons you seem to. I try to keep an even keel about it all, at times deciding to find a different place to do the activity if the instruction is absolutely that bad, and at other times, deciding to stick it out, and hope that the experience will be a learning experience for my son (and for me) as far as dealing with different kinds of people, instructional styles, etc., realizing that this is only the beginning of a lot of years of these experiences.
And like you, I realize that my son is not unique in his traits, but to me, his mom who sees his innermost self, he IS unique. And although as his mom, I am completely over-defensive, over-sensitive, and over-protective (well, at least in my mind - I try not to be in reality), I also realize that he is far more resilient than I give him credit. When something negative happens to him, like someone is unkind or something, it sends me into a frenzy for days. Meanwhile, he has forgotten about it hours, sometimes minutes later. I'm sure your little guy is equally as resilient, and probably far more adaptable than you give him credit.
It's desperately hard to put our little ones out into the often cruel world and see how they fare. We want to shelter them from all the bad out there and keep them safe and happy. But we have to remember that without tears, we can't know joy... without adversity, we can't find our strength... you get the point. We owe it to our little ones to allow them the opportunities to develop coping mechanisms, to figure how to navigate through life. But we also owe it to them to be right there for them at those times when they fall or fail, to scoop them back up, love them like only mommy does, and give them the push they need to get back out there.
Best wishes to you!