My dad works in prison ministry and yes, child abusers are quite abused when they get to prison, followed by rapists.
I've often wondered if this is because so many men in prison were abused (sexually, emotionally, physically) as children, and have tons of stored-up hate for their own abusers, so when they get a convicted child abuser in their midst, they go for the jugular, heaping abuse on one they know is guilty, as a vicarious way of venting rage at their own abusers.
From what I hear they pretty much get done to them what they did to their innocent victims.