That demo shows very clearly that he had done nothing wrong. He admitted that three dots was okay (after he talked to me), then you spam what I had sent you a few more times (after you had already sent it a few times before). He warns you to stop spamming, as would be expected for mild copy/paste spam like that. And then, you start threatening him and baiting him into banning you. It's a completely fair ban.
While I will admit that sometimes Athrun's attitude as a mod isn't the best, nothing he did here was unusual or unacceptable in the slightest. And your own attitude in that situation isn't really great for someone with an open mod app.
I'm going to close this, but @Bleed @Owl @Chrono if you have anything to add feel free to post anyways (or discuss in private)
Chat log for reference