why did i get permantaly ban

in this game there was a guy asking me if my parents could use 1% of theyr brain cause i couldent it a q. then the same guy asked if my parents were siblings and i said can you report this same guy in all chat for being toxic. the guy continu to insult my parente and i said can you stfu your 4/11 and i m 4/3 i didnt int so stop insulting my parente but he didnt stop and i said that he was a noob and na inter. the game ended and i report him when i was going to another game i was ban for ever. riot rly if somewone insulted your parente would you just be quited and mute him like wtf. At least give me a 14 day ban not for ever. Sry for my englsi but pls help me
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