A Silent Voice: How do we "deal with" a deaf person?

In chapter 2 of A Silent Voice , Mr Takeuchi brought up a fascinating maxim. This takes place after Ishida rudely mimicked Nishimiya's speaking voice, and was pulled into his office for the "teacher's lecture", to which he tells him: "There are some things in this world that you just have to deal with". This in part subtly hinting at Nishimiya -- a girl with a hearing impairment -- being "that…