Honestly, if someone is being "toxic" to you, then there's a mute button for a reason. Oh download Dota 2 and play in a low priority queue instead, how about playing some cs go where people are not only "toxic" but also spam it as well. In CSGO you can report someone for inting(griefing), and hacking (wall, aim, or both) but no button for "toxicity". Honestly, PC culture is so strong in this community it's kind of cringy, in CSGO people spam binds and nobody cares, while in league my friend gets reported for one "Get Rekt" in all chat.
Seriously though, this sort of PC culture is not only in the real league community, but also around the pro scene as well where, i think, it was the match between C9 and SSG where the crowd boo'd SSG when they were introduced and got a backlash from all those European players that like to stereotype NA. If we can't even boo against the teams we dislike i worry for the community of league in the future, how far will this "toxicity" thing be taken.
Besides, what's considered "toxic" in this community anyways? Is it the person that's telling someone on their team or the other that they're noobs, or is it the person chatting things like KYS or %%%got. If you're the type of person who gets offended by some random person over the internet offending them, they do need to get a thicker skin because life isn't like this community, people irl might call you things worse and then you actually have to do something about it besides say "Im going to report you for toxicity".