Sorry, not in my capacity to comment here. But I love the swearing you guys do, keep it up
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.
If you guys could get along for 5 minutes this could be sorted via pm, but from what I read, getting along is not going to happen. Likely no explanations are going to happen either. Might just be best to ignore each other and save yourselves the stress?
I personally think you both should delete your feedbacks as they're unimportant. Who cares if he is a "merit whore", and without a reference link to prove you plagiarized his feedback is irrelevant. Let bygones be bygones and move on. You're both long time members and should know that this is going to lead nowhere.