Toxic players in pre-game lobby and I am punished by losing LP

You start your game and get ADC which is your secondary role so you feel pretty confident about the game. You and your support are picking at the same time so everything is alright. You lock in Caitlyn because she nicely counters MF which enemy team locked and you support? LOCKS IN DRAVEN! Afterwards starts flaming you for picking an ADC and not support although it clearly says "Support" above his name. So you know that you wouldn't enjoy the game game becuase you are playing on the lane with a prick so you dodge. Question... Why do I either lose LP for wanting to play my lane but losing becuase I have no support or on the other hand I lose LP for dodging because I do not want to play with a troll? Why am I the one punished?
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