Troller Kench because he did not get his pick, bet Riot won't even ban him

Oke, so I just rage quited the first game in months and months of LoL. Why? Because some entitled baby decided to ruin the game due to his champion being banned.

During champ select our troll support asked for toplane (to play Irelia), which our toplaner refused. The troll was whining and decided to ban our midlaners pick (Zed). Zed asked to 'please not ban Zed'.

Our midlaner banned Irelia and a fight ensued between Mid and Support. I as a jungler decided not to say a word, but I was already on the verge of dodging (which I also never do). So our support takes Ghost/Smite Tahm Kench with conqueror. The Troll Kench decided to now troll me (the jungler), steals 2 small raptors, preventing me from leveling up and then steals my red.

It was at this point I closed the game and I am really doubting more and more to play this fucked up game in general.

Riot please punish trolls harder. I can't have more than 3 games in a row without an inter or troll. I don't care if he is normally a 'nice guy'. This kind of behaviour should be punished accordingly. Sadly, chances are that I get the problems due to me leaving. Once again proving that trolls can go unpunished when done in small dosages.

Please let us dodge games with such trollers.