Reading my son's diagnosis letter for autism is depressing. He is not just a bit quirky, reading that - he is isolated, lacking social imagination, inflexible, can't relate to his peers, has sensory issues, tics, can be belligerent, no sense of hierarchy.
He was 11, very bright and kind and my lovely boy at the same time. People who don't know him well would not see his "difference" but it is there, it is not just that he is quirky or studious. Now he is an adult, and he is doing well and is at uni living his best life, maths, chess and more maths.
My daughter 16, asd, ADHD and has an EHCP all the acronyms! She is not just shy and awkward. At pre-school they were heavily hinting maybe there was something "wrong" we just thought she was being herself, they were wrong! She ran me ragged as a toddler I think I was too exhausted to think about what could be behind her constant activity, and escapes, constantly running up to people to talk to them, running into the road.not sleeping well. 8 yo ASD diagnosis, 11 ADHD and meds, she will need help to live independently, it will take her longer but she will get there. She is the sweetest, kindest soul and the thought of people taking advantage of her turns my blood cold.
It is the lack of social imagination that really makes so called high functioning autistic people vulnerable. If you cannot be sure of what people mean by what they say, if you lack any instinct or inborn insight then you are prone to making mistakes. Ones that harm you or insult others, making friends is a minefield at the best of times, young people with autism are blundering into that field with a blindfold and no idea it is a minefield.
Op there is your opinion about the level of autism and ND in the UK and there are statistics and medical professionals opinions, with respect I will stick to the latter. You are making sweeping assumptions and that is fine but it is not actually helpful, just flapping about the bar for diagnosis being too low, or maybe ND is not really a disability now it is just a characteristic, like freckles or maybe you don't actually have a clue. I am not sure I agree with your request for posters not to suggest "perfectly normal" behaviours that are sometimes mentioned by concerned parents on mn, are possible signs of ND. If your child should be assessed then that will be filtered out through the referral pathway. There is a process. Self diagnosis and adjusting parenting to fit your child is also an option. But you won't get much support in school or beyond without a diagnosis and the level of help you get with isn't huge it is a series of reasonable adjustmentd in my experience.
Sorry epic post