Those players are just bad themselves lol don't listen to them, even if they gave you advice it wouldn't help you much tbh.
There's a reason they get matched with new players on their smurfs.
I'm no challenger god or anything but w
hen I create a smurf my first match is literally impossible to lose, I can faceroll 1v7896 and win the game in a short amount of time playing just about anything.
And after that match every game consists of at least 8 smurfs on both teams combined, and most of those are still easy wins, then another 5 games and it's 10 smurfs each game.
So yea just don't bother listening to them because there's most likely nothing useful they can tell you.
A tip I'd give you is either play with friends if you have any that play league or play co-op vs AI, for me those two were all I did until I was around level 25, though not everyone finds co-op vs AI challenging enough so if you don't want to play bots then don't.
But personally I think you can learn a lot more from bot games than from normal games at this point of your learning process since there's no pressure to perform well it gives you all the freedom to experiment with new champions and really get a good idea of the basics of this game.
Oh and you can mute people btw, there's nothing wrong with muting your teammates if you don't feel like listening to them.
And generally if they say one negative thing it won't be followed up by something useful but rather more negativity.