There are stuff that you cannot ignore. Try being a moderator, I dare you. You'll turn misanthropic in the end. But I believe if people know that they gonna loose something like gold or an heirloom point they'll behave. But its like last resort. You give warn him verbally (written ofc) then you give a warning, ban them and if they still don't get it, make him pay.
i'm already misanthropic, and i applied for NA Admin. Personally i would just ban them if they did anything more than flame or rage.