Hi, K.. I'm new here, and new to CO as well. We have a 9-YO son as well, and he sounds SO similar to your son I had to respond. Not sure I have any answers for you -- to the contrary, I'm pretty sure I don't, as we have been stumped with pretty much the same issue/s as you.
From the time he was in kindergarten, his teachers would always tell us that they thought he had ADD and needed to see a doctor for some medication. (I have had previous experience with this with my non 18-YO son and refuse to go that route, especially because I don't see him as really having a problem that requires such.) Second grade was an exception, though, once his teacher got to know him and figured out his learning style. Everything went really well from that time on that year. He excelled and was also tested as being a 'gifted' child.
Last year was the worst, though. He started having other boys pick on him at school and he started fighting back. Not exactly what I'd hoped, but you really can't blame him. We had moved that summer, so he was with a whole different group of kids, but it just didn't go well that year. His teacher wasn't willing to help him whatsoever in the classroom, and repeatedly suggested he needed meds.
Anyway, this year is a different story. I wouldn't go so far as to say everything is all better or perfect by any means, but it is definitely a BIG improvement. We moved again this summer (we plan to stay here in Fort Collins, so that won't happen to the kids again -lol), and somehow at the last minute I decided to homeschool him and his younger sister (she's in second grade). I am a stay-at-home mom so figured there was no better use of my time right now than to give this a try. It definitely takes a big time commitment from me, but the benefits to our whole family have been so worth it.
There are pros and cons to this, obviously, but the pros have far outweighed the cons for us. Our son is no longer having his teacher tell him he needs medical help; he is no longer being picked on by other kids in class, the lunchroom, or on the playground; he is no longer being made to feel weird because he's not into sports. He is also making new friends with other homeschoolers (even those who have similar interests...and a commonality in not being sports-minded). We also have more hours in our day to do extra-curricular activities (which before was a problem because of the late hour school was let out, and then having to do homework after that). My kids are now being exposed to more opportunities than I ever dreamed of. And best of all, he's not made to feel like an outcast anymore. He's enjoying life for the first time in a very long time and his attitude is so much better all the way around. We do still have times when he's not paying attention to his work so school can take longer than it should, but when there's an activity planned, you can bet he finds a way to get his work done on time. lol
All I can say is you have to let your son be himself (even if it means he doesn't like sports and is more of the intellectual type, like mine is). The world needs all types of people. Unfortunately, kids can be and are cruel to those they perceive as 'different.' And if the teacher isn't going to be any help, you're going to have to step in and do what you think is best for him. If you don't, no one else will. (What about getting a part-time job as a duty aide on the school's playground at lunchtime? Maybe that might help the other kids be nicer to him?? I don't know. I know you won't always be able to be his 'guardian angel' like that, but maybe at least until he gets into high school...unless he'd die of embarrassment having his mom on campus. lol)
Well, sorry I don't have any real answers for you. I just thought I'd give you a little insight into our story and hopefully encourage you in that you're not alone in this.
Blessings,
C.