My last troll was a dude who was so mad that I was going Quinn top and his support was going Ziggs that he decided to lock in Jayce as an AD Carry. He proceeded to tell us all that he doesn't play this champ and intends to troll the game. Every minute he felt compelled to remind us just how much he is going to troll. We basically ignored him while he prattled on and fed the enemy AD Carry. At one point I had to tell him to stfu because no one cares and I don't care if he trolls or not. Everyone single person on our team, even his Ziggs support was getting shit done. When he realized that we didn't care about him and all his feeding did nothing to stop us from crushing the enemy and we were all interacting with each other while ignoring him, dude actually started to try.
I guess what I'm trying to say is, having a troll is not really a surefire loss.