I can sympathize with you. I'm a parent of a special needs student as well as a parent of two DD's majoring in SpEd. A few years ago, I was watching a little boy in my home. I had never seen a young child with autism but I had been around children a little older than him with a variety of needs.
I spoke to his mom telling her what he was doing during the day. He would "flap" his arms, walk in circles around my kitchen island, walk up and down my hallway with his arms out, obsessed with shapes(what 2yo knows the difference between a diamond and a triangle or a octagon and a hexagon). The boy could not respond to his name, respond to a question...
The parents were in total denial. Their response was "Oh, he's just playing ring around the rosy" to explain him walking in circles around the island or "he's pretending to be an airplane" to his walking up and down the hall with his arms out. When I told them that he doesn't respond to his name or follow simple directions, I was told that they've address that with their GP (he didn't go to a pediatrician) and he said that it was normal.
They did agree to EI testing because he wasn't talking. Once they told the parents that he has SID, the parents pulled him from all services. They denied that he was "different".
Fast forward a few years and all of a sudden "he is a very sick boy" and they are trying everything to cure him. They've changed his diet to GFCF and have been giving him doses of more things than I can remember for chelation. They've talked about buying a H-BOT chamber for their basement. They still refused to send him to school or get any services because she said "they're all a bunch of quacks" Instead, she was paying people to come to her house and do "Son Rise" with him. He is now 7 and in 1st grade so she either has to send him to school or home school him. Today I noticed a bus at their house so I'm guessing that he's in school, at least for now.
Now, my oldest DD is student teaching in a BD class. She has a student that is very destructive to the classroom and himself. She said that it's heartbreaking because last year when he was on his medication, he was doing so well. He's very gifted accademically so they were going to test him for a gifted program. Instead, mom decided to take him off of his medication!

The boy (2nd grade) would tell DD that he knows that he's being bad but that he just can't help it.
So far this year, he's been in the time-out room at least once a day. Last week it was so bad that they had to call in an outside service that got mom to agree to have some evals done. He's been in a in-patient facility since. They're not sure if/when he will be back.
I told DD to get used to it because sadly, I think that she will see a lot of situations like this.