Don't and won't were words that sounded similar but had two different meanings. Don't was 'do not', as in you didn't want to. Won't was 'will not', as in you wouldn't.
Don't's, won't's, and can't's had become a big part in Johnny's life. He did not go anywhere by himself anymore. He would not participate in rumbles. He could not see a Soc without becoming edgy and nervous.
So you paid attention to these things, the things you did not do, the things you would not do, the things you could not do. Because it was all you could do.