There are some garbage in the forum. If you are not strong enough to handle them then they will destroy you.

Stay away from reputation board, stay away from criticizing them, stay away to unfold their lies, at least don't publicly dare to challenge them. If you really need to expose them then seek help from members who have strengths to speak out against them, give them information if they are interested. But don't dare to do anything against them by yourself until you have a highly influential account.