Every champ is used by a player. That player decides what to say and what they do. Do not hate the champion. Teemo and Cassiopia are toxic but their mains could be soft and cuddleable as their champions.....
But yeah, ive seen the raging and flaming from every champion played and every lane it is played in. Its more of a mentality thing, if people are losing they rage. Unlike Tryndamere Rage that is helpful, raging in general is not lol. I remember when Ezreal mains were the target of it.... and Lucian mains were next on the "most played by ragers", Vaynes as well...... not to mislead anyone, im not targetting ADC champions and mains lol, ive met friendly ones and ive met mumble mumble grumble ones as well.... but i have heard more about ADC champ mains being the most toxic lol..... Riven mains i keep hearing hold the "most full of themselves" award.... doesnt mean everything you here or think is true though :p