Are you just like... ignoring this dudes point?
Let's say you put up a good personal performance in a game, let's make it an over exaggerated example:
-You got fed at mid 10/0 in 20 minutes
-All the other laners ended up 0/10 in 20 minutes
-Your jungler died 5 times in his jungle and quit at 15 min
-Your team surrender votes at 20 minutes 3/4, you lose.
If the same scenario unfolds game after game, that's not you being on tilt. If your personal performance stays steady or even improves, how are you on tilt? This bizarre notion that other people playing terribly necessarily causes you to be "on tilt" is just... illogical.
It's a team game. Sometimes members of your team play like shit. Sometimes it happens several games in a row. It can be demoralizing, but just as often it doesn't affect your personal performance.
Why are half the comments on the boards some attempt to normalize being terrible at the game and not caring about it? Why am I seeing you post some garbage that proposes:
perhaps the person on your team that feeds each game isn't just some feeder, but a manifestation of your own inner feeder- you must meditate and calm yourself because your attitude towards feeders is causing them to magically appear in your games
Stop. Just stop.
Starting to play badly yourself and continuing to encounter bad teammates is not the same thing.