They'll want to see facts and figures. Tell them where exactly the money goes.

How much of it goes into the pockets of the people who run AS for their ritzy lifestyles?

Whom do they serve and support?

More tenuous, but possibly helpful: Collect all the instances you can find where AS supports and promotes the sentiment that autistic children would be better off dead.

The sane side needs its own billboards, PSAs and promos. Would the appropriate organization be ANI?