Parents complaining about my son

[AnonyMust]

So upsetting.
My son is doing so well. He'll be assessed (for ASD) within a week - after four years of wondering/ a journey of puzzlement.
Parents have, despite his efforts and improvements, decided that they don't want him to be near their children. They gossip about him and have today (one parent) complained about him as they have to put up with him in their child's class and NOW... he's at camp. The leader told me the gist of their complaints - things that he didn't remember doing and that hadn't been seen. The parents are furious and the leader is just apologising and saying he's there and can be in a different group but ... NOT TELLING THEM TO BACK PFF (despite telling ME that the parents are vile and have it in for him despite his good behaviour.
What do I do?????

[Greyhound]

That's awful :( Same happened with my late sister who had SN :( Got sick of people complaining that she was 'stroppy'. She had a brain injury, FFS

[AnonyMust]

Polter - thank you. Soooo helpful. I did come across an ASD support group in my search - so something came of it.
The camp thing has progressed - or rather, worsened:
Girls (sisters) tripped DS up on purpose and reported to parents that he lay on (vs landed on) her little sister. I went to watch the camp show today. It was love APART FROM THE LONG STARES (lasting over 60 seconds each) that were aimed like daggers at me!!! I didn't want to back down so had to literally stand up for myself by staring back. Like children!!!!!
One if the sisters told DS that their mum had reported him to The office for bullying!!! The irony.
I'm ... very upset. But hope to gd that he'll continue to be a good boy.

[AnonyMust]

Pink Rose & Grey, I am in the sand wavelength as you both. Wish others were, too. Feeling low and losing hope for how next school year will go as this mum and one of her DD's is in my DS' class ;(