Alright, first of all, I'd recommend not feeding into those "kids" as you like to say. You're simply giving them the reaction that they are wanting, and stooping to their level. Secondly, you will not receive punishments if you have disconnected from a game one time. Riot understands that sometimes things happen that you are unable to control, which is the reason for the Leaver Buster system working in this way. You have disconnected from more than simply one game if you've been punished.
I'd suggest not creating posts while you are angered and/or tilted, as you will only make yourself out to seem somewhat foolish. And if you are leaving League, then best of luck in whatever game you decide to play next.