Can only play one role? Stick to teambuilder. People are trying to climb

4th pick says "adc" I'm first pick and lock draven since that's my go to right now. Guy picks vayne and goes jg cause yolo. Mind you, I was not upset about this and I believed it could work if she grinded to sated. over 25 minutes in and she has 14 stacks, then proceeds to farm lanes instead of her jg. Tells everyone "1st time jg, I just adc." Needless to say we lost, then unlucky me gets paired up with this player in the next matchmaking. So I tell this player "stick to teambuilder if you can only play adc." and her and her buttbuddy who I guess was duo'd with her tells me to go eat shit. So I dodge, lose more points and I'm just salty from all the points lost.

I really wish there was something we could do to prevent this sort of thing. I was sportsman like about it in the 1st game and had faith.

On a side note why is it that everyone has to play vayne every game and if they don't get adc, then they go jg and do all of this crap? Could we put vayne more in line already? I mean as a draven player I kind of enjoy the jinx/vayne meta, but kinda don't at the same time.