I created a new account only for my first main character for 7.5 (!) years, Tristana.
And of course, I am back at Level 1, right now at 10 or something and I often hear the "He/She is new, stop flame him/her".
But then, I had not a SINGLE real NEW PLAYER that also really WANTED TO LEARN something.
There are only two type of bad players so far:
a) A premade that does not go on a lane togehter, e.g. a beginner Sivir and a Yasuo, the first on bottom and the latter on top. The problem is, that often the enemy is then also premade and usually on a lane. So a random and a noob are on a lane together and don't really work together. The poor support has enough of a Sivir right-clicking mind-numbingly until she is dead (I witnessed that with an Amumu) and just said that she sucks - for obvious reasons - and the suddenly her toplane premade interfers and rages and yells the "SHE IZ NEW NO FLAMERINO". And guess what, I am so tired as fuck about this bullshit - also a fault of that garbage matchmaking justifyng insanely different premades (Level 35 and 3 together, enemy is average 15 for example, too much for that Level 3).
b) People that do not think, do not speak, and behave like bots. Listen, I never played Battlefield in my life, or when I first played let's say Tetris, I learned the very basic things pretty quick. LoL might take some time to master your champion, but seriously, if the enemy Ashe is 0/12/0 because she is permanently on bottom, right clicking minions, not using skills, not talking at all (especially in Europe with our 15+ languages, they often do not speak English for some reason, because education is not a thing in Poland apparently) and fires her ulti 10 meters off any target than it has nothing to do with "being new", then you are sabotaging.
When playing Tetris the first time, I did not die 12 times in a row because I did not figure out that I can erase lines. And an Ashe should realize when her health goes down, that she might move off the lane. Of course, there is THAT guy on the winning team profiting from that Ashe that yells "SHE IZ NEW WE ALL LEARNDZ THE GAYM". Well, learning the game and being worse than beginner bot are too differner things.
There is not a single real newbie that says "Man, I am new, how does this work?" or "how do I shop?" or someting. They are just there, a bar of lead and suck big times. I had a Brand of the same level, just dying forever, always away from any teamfight. He did literally NOTHING to learn the game, but he talked big and in the same dumb reasoning like this thread: "I AM NEW, DO NOT JUDGE ME THAT I DIE ALL ALONE AND NEVER USE Q, W, E, R".