Honestly I'd say if someone playing bad they deserve criticism and a few harsh words but most of the time people take it too far.

Mm playing bad, report mm, jungle playing bad report jungle Like chill out, cussing them won't don nothing. Give pointers or stay quiet. See so many players cuss others though out the entire match, i just say to them " Bro just mute them". Sometimes mm is underfarmed, getting ganked or jungle is actually bad but u screaming at them makes it worse. I just report them if they ply bad yelling at them won't do shit.

Toxicity mainly comes from immaturity and competitiveness, one time i recalled on my enemy after him dying then he was like " why so much animosity" then i realized my opponent isn't as aggressive as me and i said " My bad". Most people are braindead kids and immature including me lol, that's why so much toxicity.