I get that some level of accessibility is reasonable, but if you're expecting the same level of UI investment there for <1% of the population, I'd call that insane. Here, he can still call in and order the pizza.
0.77% is something that would be protested ordinarily, except when it comes to accessibility concerns. Why?
This is one of those basic human rights things. Especially if the service your site is offering is important or one of a kind. And especially as more and more things become accessible only through the internet.
This is also the reason many of us have to step over used needles on the way to work every day, there are people who are going to die very soon from using heroin on the sidewalk, and there are lawyers lining up to sue if anything at all is done to discourage them from shooting up and passing out on the sidewalk.