Like you asked “is there such thing as normal?”. What’s normal for one person can be totally crazy for another. If I were to describe normal I would have to say normal is predictable, a set routine. Again not saying that everyone’s set routine is the same, but everyone’s set routine is normal. People can have guidelines and rules they live by that they view as normal. When they meet someone with opposing views and unpredictability, they would then most likely view that other as abnormal.
So yes I do believe there is a normal, but normal is completely unique from one person to the next.