And let's be clear... YOUR idea of "not doing anything" about his disturbance and MY idea of "not doing anything" may be really different.
Example...
I have ds1 in the supermarket, in the wheelchair trolley. He is contained, not touching anyone or anything, but he is loud. He is stimming, he is shouting occasionally, and he is babbling nonsense words because he is trying to cope with the sensory overstimulation in the supermarket.
People are tutting, staring, and I can hear someone grumbling to the person with them "God, isn't she going to DO anything about that? He's so loud!!"
So.. in their opinion, I'm not doing anything. But... they don't see the sensory item he is playing with in one hand to help cope, they don't see me talking to him quietly to keep him calm while I quickly go through the supermarket, they apparently don't notice that his younger brother is along as well and has SNs and I am trying to keep him happy and relaxed as well, they don't realise that the reason he is IN the wheelchair is not only because his legs get tired, but to help him cope with his surroundings - otherwise he WOULD be running around, hitting things, throwing himself on the floor.
So yes, I am doing something. The clarification here is that I'm not doing what THEY wanted - which was basically shutting him up. Never mind the fact that it is OKAY for him to make noise - this is a supermarket, not church FFS. Never mind that he's not hurting ANYONE. Never mind that they are being nasty and hurtful. But they are solid in their opinion that I'm not doing ANYTHING to stop him.
It's often all about perception.