I played with this guy NeptunePisces who blamed me and my teamate every time he died... which was often.
Played against him a few weeks later and figured maybe he had hopefully learned to play by then but honestly didn't think so. I probably shoulda warned the other team but I'm really not a good person deep down so I just told our team the the other team's UB wasn't very good and was gonna blame his teamates for sucking. He did and my teamates tripped out on how accurate my prediction was.
Saw him try and enter games I was in sometimes... he would get the immediate boot treatment... I didn't have to say anything, other people were experiencing the joy of playing with him.
Long time later saw him as the examble Frogboy gave about overlay updates and showed how he put a personal note down about him being a rage quitter.
My point is that there is a breed of demigod player out there that cannot get any better because they never have any responsiblity for their team losing. It was either they played against premades, their ally didn't save them after they chased the enemy past 3 towers, someone on the enemy used the dreaded "cooldown hack" (played a game where my teams reg got so many kills he bought Slayer's really early and the guy thought his critical hits were snipes), or my personal favorite "You only won because QoT is overpowered."
I don't think referring to someone like this as "playing like a spastic bathtoy" is a bad thing. Its not contructive, but people like this have something very wrong with their brains, so you can say whatever you want about them because they really don't care what anyone else thinks about them, because they're always right, and everyone else is a bunch of idiots.