I totally agree. Just because someone hasn't memorized what school you went to, what language you grew up using, and how "oral" you are, does not mean that they can't read.
Can you imagine the firestorm that would rain down if a hearing person accused an ASL user of being unable to read??? If the hearing person made fun of their writing? AUDISM, much? PFH is doing EXACTLY the same thing. He is saying that oral people and spoken language are inferior to ASL and ASL users.