How to protect yourself from Riot Games!
Riot games implemented an IFS(Instant feedback System) program into their game that detects and picks up on key words that would deemed to be unacceptable in society and their game.
You need to protect yourself from this system, because RIOT does not manually give the ban as they allow the computer system to do it. It is not a competent system as it cannot take context into situation, and has no morality or ability to judge what has happened like a person could.
The way to protect yourself is to not use the chat, not using chat when you play with random people will give you the upper edge. It will allow you to stay free of conflict that an automated system could ban you for. Even if they are trolling you, egging you on it is honestly better to just alt tab pretend to play afk(that is the truth) then to be banned for defending yourself with your words, or you could continue to play. Riot doesn't care about self defense in any way or form, they want you to let them deal with toxicity and you defending yourself verbally is toxic. (they are controlling)
Protect yourself if you value your Free to Play account(that you spend money on), they have a large player base and rarely gives the time of day to players that were unjustly banned. Occasionally they will unban people depending on who they will save with their mercy, but most players aren't.
Take care.