Is it just me, or does my reading this CoC say that not being nice is okay (and accepted and required) when dealing with people deemed not nice? This is what t

Is it just me, or does my reading this CoC say that not being nice is okay (and accepted and required) when dealing with people deemed not nice? This is what troubles me - I was brought up to be nice and behave well to others. We are more alike than different. To say "we should behave different to others who are different" and "we can behave as bad to others because they are different" is wrong and only leads to conflict and harm. Of course I could have read it wrong and am reading too much into it! BE KIND