I need to play out this game?

So this guys apparently banned his own champ in champ select since I banned riven and he was playing ADC. Now he starts the game with "lets see how much i can feed top, because he banned my champ". And then walks into the turret and gets executed (and doing this again as soon as he re-spawns). After I explain that he banned the champ himself he still continues trolling. Now I already lost last game because someone went afk and I just want to play a normal game after a 12-hour school day. Is it really that weird that I left that game? (we are talking plat elo btw).
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