The toxic attitude towards new players

I recently am trying to help my friend join and get started in the game but the problem is that when i went to play with him against bots people started flaming at my friend for playing badly. He just started playing and i don't think new players should have this negative attitude towards them. So this is what i am suggesting to put some kind of sign at the top of the loading screen of the player to show that they are new. Asking to stop the negative behavior is hard and will take time. I just think that this will help new players enjoy and maybe continue playing league of legends. Comment what you think below and if you have any suggestions please feel free to tell me and I will do my best to respond.
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