Forum:Getting banned from the chat

Now all of you know the chat, Roranoa zoro recently received a star that is visible on the chat and the right to ban people from it. But I don't know when a user should be banned from the chat? Also I didn't find any rules on any forum regarding getting banned from the chat.

So I believe we(or only you) should start creating some rules otherwise, users wouldn't know how to restrain themselves on the chat. Which should these rules be?