My favorite is when the ADC goes 1/4/0 in the early part of the match, then their fed bot pair starts killing the crap out of you as the support, and u end up 0/5/3.
Then your team is like "STFU you suck, 0/5 feeding moron."
They refuse to understand that you were forced to try and support a brick in the ocean.
If you dare to ask "What was I supposed to do, take the ADC's ONE FUKING KILL so I can be 1/5 and they can be 0/4? IM THE SUPPORT, and I have nothing to support, of course my stats look like sht!" Then they report you because they dont have a comeback and have to face reality that its them that sucks. Making people face reality gets you reported.
On the jungler side, so many people dont know how to "receive" an allied gank. They just expect the jungler to come in, do 75% of the enemy health, then tank until they get the kill.... and they expect you do it WITHOUT farming your jungle, they expect you to be IN THEIR LANES BUSH 50% OF THE TIME. So do the other lanes. They dont want you to get farm, but they want you to do all the damage when you gank...
So big shock, delusional kiddies have no realistic expectations of other people, while being self absorbed whiners that blame others for their own failings.
So yes OP, saying that it ISNT always support/jungles fault is true, but dont try to make people face reality of their own failures in a game, its about as effective as telling someone their religion is wrong because of x, y, z reasons. They will always have a reason to keep believing.