Get over yourself
If you're the type of dude to spend an indefinite amount of your life insulting someone in a post game chat who has already admitted to playing a shitty game, you're a problem. It's just a game. You're not getting a check or paying any kind of bills off of these matches (not if you're in my elo), so stop taking it THAT seriously. If the assurance of causing anyone some sort of discomfort, irritation, or frustration really gives you that much of a tingling in your loins, I don't suspect anything that I (or anyone else that has posted in this specific area of the forums) say will make a difference. But if you just pop off at the end of games because you get heated in the moment or because you just have to keep reminding that enemy laner how awfully he played even if he/she never insulted you, keep in mind some people like to play this game to do something enjoyable after a long day of work or what have you. Not to deal with that ignorant bullshit. Get over yourself.