It's true that some might express theirselves rudely by accident, but I meant those people who realize how they act and don't care other peoples feelings or even worse; are proud of being bitchy. You know the type? This behavior can be bullying but it can also be for example kind of "harmless" picking which is disguised as humor, but is actually insulting and not okay..
"And another thing is the measure and understanding of norms and what is okay and okay. These "okays" are different for different people." This might be related to that kind of beahivior I described..