I can totally confirm that this can be the worst, teachers who're supposed to look after you for several hours a day shouting at you, shaking you and yanking you (not sure if this happened here), answering "what's going to happen"-questions/autistic repetitive questions in intentionally misinforming and, I think, vile ways, calling you names (I know of a case in which a young kid was called the worst of names such as a****** in front of other students not just once either) - because even if you don't understand every single word they say or their physical mistreatment, that really has the power to make stress levels in any kid sky-rocket. And ridiculously high stress in autistic kids and adults, they hamper development of new skills and academic learning and learnt skills and abilities such as doing maths or talking or going from familiar place A to familiar place B can suddenly turn out to "be gone". Way to go when dealing with autistic people.
I understand how come teachers at my regular school over 10 years ago in 5th and 6th grades had no understanding of this (though I can't forever understand how come they laughed and pointed and didn't try to get someone else involved to help me), albeit I have very little understanding of teachers like that these day who can receive of help and get tons of information even if that can make several workdays end really late. And most of all, anyone working for serious in a classroom specifically for autistic students should be painfully aware of this so there's the excuse of ignorance and not knowing of the severity of the consequences of their actions is working 0%. URGH. So disgusting.
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Autism + ADHD
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The trouble with having an open mind, of course, is that people will insist on coming along and trying to put things in it. Terry Pratchett