I'm so sorry difficult child 3 is going through this and what you're having to do to get help. I've been thinking about how our difficult children are affected by other peoples ignorance and I wish there were a simple solution like making up a bunch of t-shirts with an explanation of our difficult children diagnosis and all that comes with it. Then I think how awful it would be to be branded like that every day. Then I go back to thinking how great it would be if you could tell something was wrong and what it was, just by reading their shirt.
difficult child 3 did not deserve to be attacked and I'm amazed from your earlier description of the log that it didn't do more damage. Poor guy! Much of how he acts, looking to see where they are so he can avoid them, telling the kids to go away when they come near, sounds so much like my oldest difficult child. It breaks my heart to think of what yours is going through.
I hope you find some resolution to this with the parents and kids. Maybe if you spoke with the receptionist friend she could set something up with the other parents? I hope things get better! Ya'll are in my thoughts.