What I just experienced in low level play
I was at my friends place and made him play some LoL. He's level 20 I think and I watched him play 2 games.
The people there were crazy toxic. For every mistake there was something like "uninstall you noob", "stop ks, go afk" etc in the chat. My friend says, that this is why he stopped. :O I can't believe that people have no tolerance towards new players. I know, Level 20 isn't exactly new, but I'd still say it's beginner level. Instead of helping, people just keep flaming.