Seriously, these people piss me off.
Today, when I went Ezreal mid (as I always do when I can), an Azir after me decided to go as well. Normally, I wouldn't care, but this one offered the other team a skin when they'd kill me, and sold out my position and abandoned me any time they came. I wish Riot would ban these people, at least. It's ridiculous that they instead focus their efforts on the next kid to say "fuck" when he dies.