Support harassing and taking minions

Okay, I have muted everyone at the start of the game. Never said anything or flamed my support. But when he got titled because of the lane, my Rakan started to harass the minions and take cannons and last hits away from me. I COULD NOT FARM AT ALL... IS this even Reportable? I got so frustrated because I just could not play the game at ALL... the rest of my team could not help me because they were having a tough time too.. but how can a support troll me like this? I did nothing to him..... I know its bad but I just AFK'd because I can't play the game. I was like 20 CS behind the vayne and was doing pretty well and keeping up... Why do people have to behave like this.. is it just Low elo?
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