Chapter 8: Why doesn't Johnny want to see his mother when she finally comes to the hospital?

From the text:

"I said I don't want to see her." His voice was rising. "She's probably come to tell me about all the trouble I'm causing her and about how glad her and the old man'll be when I'm dead. Well, tell her to leave me alone. For once" ---his voice broke--- "for once just to leave me alone."