Surrounded by Cuckoos, but I was the crazy one

I'm having a hard time figuring out what to write on this topic but the first thing that came to mind was arguments and how people sometimes lose sight of what they mean to say when they become defensive. We're all guilty of it, some of us more than others. From that type of person's perspective, everything their debating "opponent" says sounds crazy simply because they stop thinking rationally. In reality, the person who thinks everything they hear sounds crazy could be the one who is spewing insane thoughts. My next thought about this topic is the book, which is an obvious thought now that I think about it. At first glance, McMurphy seems sane compared to the patients at the mental institute. "Normal" society would consider these patients to be "irregular" and "crazy", which is why institutions such as mental hospitals were created. Mack, coming from this society, sees the patients in the same way. As the book goes on, the reader starts to see Mack lose it little by little. He's not necessarily acting "crazier", but he starts to go to greater lengths to prove how rebellious he really is. In the institute, Mack is seen as the truly insane patient because of how he acts toward Nurse Ratched, regardless of the possible consequences. The other patients, in my opinion, start to see Mack as society would view them.  I guess the point that could be made from this is that everyone that seems "normal" may not be and that they will show how crazy they really are once their pressured to do so. Still not quite sure what the topic really means though...