I once had to support for a player with: Soulstealer Vayne, Vayne Mastery 7 and a silver border. I knew the instant I stepped into that login screen that I would be flamed to hell and back.
And I was, because apparently, as Soraka, I wasn't healing her enough, good times.
I just read your post and said to myself, "it's just a meme, things can't be THAT bad". Then, i queue for a relaxing normal draft game and i get this: http://imgur.com/a/vCiVX This person lost lane after permanently flamming at jungle and support. Then proceeds to walk down various lanes farming and giving the enemy kills. Whenever we pleaded her to stop and group with us or w/e, she simply responded, kill yourself or DIE!! Despite all that, though, we managed to keep the game alive and after they took a couple of barons and elder dragons we managed to win the game without her being present. Feels(bothgood&bad)man.
lol I love you people
How does that represent 
Yeah, you got me, I'm guilty. Vayne's my (second-)highest Mastery ADC (behind Ezreal, whom I was only playing for freelo) and I fit the stereotype.
Playing her is inherently toxic. Never touch Vayne. insert "send help" gif
It's true, this is what people say to me all the time
My best friend is a vayne main. He just finds her as the only fun ADC, he even played her when she was trash. He was fun to support as well.
Other vayne mains need to learn from him.