Yours is such a success story!
I am an elementary school teacher that sees on a daily basis each parent's unique concerns. There are the very bright students who are not challenged enough and the struggling students whose parents feel we are too demanding. There are compliant children who are pushed to be more mature than they already are because they are made responsible for ignoring the other student's poor behavior and the behaviorally challenged students who are not getting the best education because they are over stimulated and, perhaps, misdiagnosed. We are supposed to give the best level of education even with a student yelling, pinching, hitting, and cussing. Or with them being withdrawn, empty, and unenthusiastic.
I am so glad that your son found a good place for his unique gifts and educational level. Please, everyone, stop to think about your school's teachers who all love kids and do their best to make their day a great and productive one. We are human and use everything we have learned and all the skills we have developed to make each and every student's experience the best it can be.