Can Riot please blacklist some words/phrases?

IDGAF if someone gets wrongfully banned. They can provide an explanation in a Support ticket.

If you tell me to 'go neck myself' because I made a silly mistake, you need to be suspended as soon as the game ends - effective immediately.

If you need to use that sort of language in something as trivial as a computer game, you seriously need to go get some help.

Like I said, if you've said it in a harmless context you can go submit an appeal. Riot answering appeals would be faster than addressing each and every report.