In what way?
Reading is not dependant on hearing in any way.
Again:
He's expected to at least try.
You aren't born knowing how to speak, everything you say until you're teens is what you've heard other people say. Expressions that you hear are things you commit to memory. When you're little, that's how you learn to speak and sound fluent, because you're constantly picking up one what people are saying around you and to a huge extent, what you hear on television. This is why children say bad words when they watch dirty programming, they're imitating what they hear and trying to find where it fits in their immature lexicon that eventually evolves into their dialect.
Being deaf completely robs you of that experience. You never, ever hear anyone talk. You never pick up things in conversation, no colloquialisms, expressions, nothing. Everything he's heard in his life has been through sign language or text, and since we don't learn to read until after we've learned to speak, he's behind. He never learned to speak, the only people that can communicate with him are family members and the like that know sign language, he doesn't use speech in his day-to-day activities and is completely incapable of building on his dialect because it doesn't exist. While we read text as speech, to him it's raw information, bland, inhuman data.
The fact that you could be so unempathetic to that is downright revolting. Yeah he's an ass, but ripping on him for his grammar is just as bad as saying "HAHA UR DEFF LOOOOL", it's disgusting.
