What MON said.
I would not encourage you to become cynical about the school; as long as your DS is there, they are your partners in educating him and treating them as partners, with polite and honest communication, will be important. But also know that they may or may not, over time, become better able to see the gifts that are there. For us, things got radically better after they did their testing for the gifted program in 2nd grade. That was a long haul, waiting, but it did get better.
This is like driving a car: keep one eye on what's right in front of you in the near term (is your DS happy? happier when studying out of school, or happier playing? Getting enough of a balance of learning, exercise, and play?) and one eye looking further away into the distance, maybe 4-5 years out (what learning options exist in our community that DS might thrive in, and how do we pursue them? how do we set him up for those opportunities now, soon, and later?). Don't borrow trouble fretting about the distant future; just have an eye on it. Most of your effort will need to go into the near term; he's young yet.
Hang in there.
DeeDee