The culture is in their methods of communication, as the man even said. Therefore, being able to hear does not put you at odds with that culture, whereas limiting yourself so drastically sans hearing is a huge disability just to living in the real world. Humans are visual by nature, but as I'm sure you well know, hearing helps us identify what we can't see. So let's start a wheelchair "culture" because we all percieve the world from a rolling chair and I'll be darned if I can ever stand again.