I'm playing on TTT I leave the server with a report against me Would I get banned because I left with a report on me? Or would it be situational, ie if the report's valid i get banned, if it's not valid then i don't get banned
All that is correct^ Not responding to a report can also lead to being valid unless it's a false/joke report. It also doesn't hurt to ask staff online if you're good to leave prior to disconnecting.
Very important to note what Panda said. Yeah it's RDM & Leave not reported and leave, but even if you know it's not RDM, you have got to make that known. An unanswered report may very well end you in the gutter.