How is my account perma banned and these people are not? Riot!!!???

The very first game on my alt after my main account got perma banned for something i said to my friend as a joke I join a game with a enemy duo with the most racist names you can come up with and that same person told me to ''slit my wrist and to hang my self'' was not banned and still played the game that whole day. So my question is how am I banned for a JOKE and these people do not even get punished??? That is why I think that i got banned without justice and therefore I feel oppressed. I can not be the only person feeling this way. Ty everyone for reading this and supporting me and the other people that got oppressed by the report system.
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