Why was I punished for this?

Recently I played a game with a graves with the name of 'htiloas.' Below I have pasted the things I said during that game. None of which I thought were offensive considering I got a 25--game chat restriction. The only thing I will admit was offensive was my use of the 'n-word' which I will take responsibility for, but it wasn't in any means an intentional racist comment or threat. Game 1 Player l: dis boi graves Player l: you were offered jungle Player l: and you decided to go graves adc Player l: loooooooooooool Player l: ??? Player l: i'm thresh aren't I? Player l: lmao Player l: so mad its hilarious Player l: nicre Player l: ? Player l: graves is flaming Player l: im not gonna support him Player l: didnt even leash jungle Player l: wtf??? Player l: you called us %%%s and you're gonna say 'im not saying anything' Player l: lmao Player l: nopls Player l: haha Player l: lol Player l: :D Player l: wp guys Player l: nah Player l: .-. Player l: more kills less deaths :) Player l: awwww Player l: dumb slow Player l: I was just trying to recall Player l: no harm done Player l: chocolate %%%%%% Player l: owch Player l: ggggg Player l: lol I don't think this game was worthy of a 25 game chat restriction seeing as Graves was being toxic, calling us offensive slurs, and was repeatedly and openly rude to all of us. Someone please help me, if any of you have any experience with this kind of situations. Did I do something insanely wrong to warrant this punishment? If so, please let me know. Thanks!