I know of one too. Businesses in my area that are in the know don't improve anything for fear that he'll sue the crap out of them. The ADA laws are very precise and many contractors don't follow them - putting businesses in a monetary bind. There are businesses in my area that have closed because of it - others have cost of tens to hundreds of thousands of dollars to fix to spec.
Unfortunately the best thing to do is not improve anything - sit idle - if you dare to make your business more accessible and don't do it absolutely correctly - you are toast.
Accessibility on websites is a big thing now. I don't know if anyone has been sued, but it would surprise me.