I am sure you feel differently regarding your son. But as a person with a disability, I can tell you that this never worked in my family. My mother might be motivated to do all sorts of things, but most of them are not helpful or even subtly counterproductive.

To sum it up: If you speak for someone, you are likely patronizing them.

The sad reality is that the mainstream does not want to think about the challenges facing disabled people and they are all too happy to simply ignore the (perceived) minority which is directly impacted by them. All these absolute assholes who park on parking spaces for the disabled come to mind. Those people will only ever be convinced if they are not confronted by a broad section of society. It is simply not something that a minority can ever hope to achieve without the explicit support of at least some part of the majority.

In my experience, someone standing up for me seldomly did anything good for me. They might feeel better.

But I am not going to convince you either way, so... All the best for your son.