I agree totally that it's hard for other people to understand, because AS isn't a visible disability. However, that doesn't mean it doesn't exist, and it also isn't an excuse for the people responsible for educating our AS children to ignore their needs.
My own opinion is that it's very important for us to make sure these people are MADE to see that there are things they can, and must, do, in order for our children to get the best out of their educational opportunities. DO NOT let them blame you, or our AS children, for their condition. DO NOT let them neglect their obligation to treat our children as individuals, and cater to their specific needs. Many AS children may SEEM "normal" to those on the periphery of their social circle, but we know they have difficulties which, often, can be helped with very simple adjustments. It is our responsibility, as parents, to make sure these difficulties are pointed out to the relevant people, and that the adjustments are carried out.
My son went through his schooldays without the benefit of a diagnosis. I was made to feel like an inadequate parent throughout. My son was made to feel like a badly behaved, but normal, child. As a result, he got nothing from his education. Don't let this happen to your child, or perpetuate the situation for other AS children by keeping quiet about it.