Ok, lets look at your points one by one.
You have not played on this server for years and years, its only a year old.
"I don't know who owns the server or who is his superior"
You are supposedly a regular player, yet you do not know who I am? or what the Rebirth Group is, on a server called Man Vs Bots REBIRTH? You don't even seem to know of the 33rd who host it and also provide admins.
No other admin i've spoken to has seen you before on the server, or know you. I have never seen your tag on the server before as a regular, and I know all regular players and bot commanders.
The reason RIP was banned was for Racist abuse of fellow players, repeatedly. He and his friend (which I guess is you) have been trolling the server for awhile. He had run out of warnings, kicks and temp bans, and chose to ignore this final kick and warning. Banning a player for calling other players "fucking niggers" etc, and worse, over a length of time in which he has been repeatedly warned, is not - to quote you, someone "being clearly mistreated and abused and not done anything wrong". This server has rules, one of which includes no racial abuse or slurs.
You then chose to "stand up for him" and issued threats to an admin. You also ignored another admin, Lotte, who told you racial slurs were not allowed and proceeded to argue the point.
You were given the option. You chose to support a racist troll and threaten an admin with falsely reporting for abuse whilst carrying out legitimate enforcement of server rules. So, you joined your friend.
Your post above shows that you believe you and your friend have the right to do whatever you want on a free to play server that you contribute nothing to, whilst ignoring the server rules, and have no regard for the people that provide the server, create the maps and scripts for the gameplay, and put in many long hours as admin and troll prevention.
Your "rights" as you perceive them, do not outweigh the "rights" of the 60+ other players to enjoy the games without being abused, and of the "rights" of the servers admins to carry out their duties and be shown some respect.
As for your post, it reeks of self important pomposity with such a breath-taking sense of entitlement, whilst at the same time showing complete ignorance of the server, its admins and its rules, that there is no doubt in my mind that banning you was the correct thing to do.