Okay, so the biggest thing I really see is that his adverts were ERP. I can't really get behind him getting warned for false sits because you did violate and abuse your authority as an admin by literally taking your own sit. I see that he called you "dipshit", I don't know what the conversation was like, so I'm not sure what else was said. He could probably be warned for player diss, but it looks like he was doing it in response to you taking your own sit. Honestly, you should of just clipped him RDMing a d-class, made a report in game or on the forums, and been on with your day.
+Support for being warned for ERP, player diss, and RDM/ARDM
-Support for a ban
-Support for a warn for false sits