Reducing the trolling by stand your ground option
Okay, I can already sense the downvotes coming for the simple concept of "stand your ground" which means anything but turn the other cheek and mute, but, hear me out.
I've taken two years of psychology, and in my immediate family I have a psychologist who practiced for decades. The inevitable conclusion of League's situation is that it is unstable and the current behavioral "penalties" are simply not going to work. People find ways around getting in trouble, using masked profanity or phonetic/orthnographic versions of certain words. Trolls know how to agitate you, since they can sit there all day and do whatever they want but if you respond you're guilty. This is the wrong attitude to take.
The concept of stand your ground is simple; If somebody attacks you, you are allowed to attack them back once. No hate speech, no death wish/threat, just something that people would say to each other. If they attack you again, you get one more response and so on it goes. The only person taking punishment, however, is the initiator of the first attack and not the person who stood their ground and simply gave them their own medicine back at them.
Example:
Summoner 1: Wow you really suck dude Summoner 2: Leave me alone Summoner 1: Or what you gonna cry? Are you a little baby you -expletive- feeding trash? Summoner 2: How about you go (expletive) yourself?
In this exchange, Summoner 2 is not penalized. They are clearly provoked. Summoner 1 bears the full brunt of verbal abuse and negative attitude.
Punishing the victim of bad behavior encourages the proliferation of bad behavior. League is a gigantic example of what I say because as you can see, the trolling and AFK and such is getting worse and not better. So your method IS NOT WORKING. It never will, as long as people can bend and twist the rules and take advantage of technicalities. Dare you say anything back, you're reported and you suffer punishment.
In this way, you can trash talk directly back while not being punished (as long as you follow the concept of no death wish/threat, hate speech, etc) ONE TIME everytime someone hurls verbal abuse at you and they receive the punishment. This turns the tables on trolls, and yes I know they have many accounts and such but even those who will downvote me, ask yourself this question:
Is the current system of player behavior showing more toxicity the last three years or less toxicity in your experience?
If the answer is more toxicity, we need to start having a conversation. If you think the game is fine as it is now, that's your opinion. Either way, stop and think before mindlessly voting and bashing. It is demoralizing to be attacked repeatedly and if you dare say a word, you get punished and the trolls never do. In life we have no "ignore/mute" button - we have to deal with it. This method is far from perfect but its better than stand there and say nothing or get penalized like we have now.