Normals are where everyone is told to practice new champs or learn new roles. Honestly it's a horrible place to learn with how inconsistent it is (playing against a Diamond one game and a Bronze the next game) but that's the best we've got.
That said, berating players for being bad at the champion or role they are trying to practice doesn't help them get better. Unless you want people first time a new champion or role in ranked, then let them do it in a normal.
It's great hearing your support go, "Our top sucks. Do we even have an jungler? Mid won't leave lane. And our ADC is missing CS. Just FF and go back to bots, yall suck." It's a normal game, geez, let people learn. You aren't going to be demoted because you lose a normal game.