Each site is different, often the bully type person is talked to about their behavior. However, that won't change the fact that that person in some way feels threatened. It could be anyone that bothers their need to feel like they are some kind of top dog. The person wants you to feel unsafe and be able to claim their sense of control again. They can say some very mean things if they get you alone too trying to say you are the bad person in the picture. The lesson learned is that the more you share with someone the more they have to wack you with when they feel threatened. I think these type of individuals will always be out there too. The longer you live the more you learn that reality.