Is he seeking out recovery at all Sleeper? Is he trying to quit, in therapy, going to AA or anything?
I'm glad you have the book, it helps when you can read things that you can even partially relate to.
It's hard to become resistant to hurt, you really kind of have to detach yourself a bit you know? Detaching doesn't mean giving up, but what it does mean is you are taking care of yourself and good self-care is so important for you right now. Try not to let yourself get too isolated.
Being yelled at and put down is abuse you know. You don't deserve to be abused. You deserve to be treated with respect and kindness.