Good Afternoon,
When you downloaded League of Legends and created your account, you agreed to RIOT's Terms of Use. Essentially they gave you a contract and you signed it.
Part of these Terms includes the following:
Section 5: Code of Conduct:
5.1. Can I troll, flame, threaten or harass people while using the Riot Services? (No. If you do, you might get banned.)
V. Transmitting or communicating any content which, in the sole and exclusive discretion of Riot Games, is deemed offensive, including language that is unlawful, harmful, threatening, abusive, harassing, defamatory, vulgar, obscene, sexually explicit, or racially, ethically, or otherwise objectionable;
Furthermore:
2.1. How can my account be suspended or terminated? (If you break the rules, Demacian Justice will be visited upon your account!):
2.1.2. Us. We may terminate or suspend your account if we determine, in our sole discretion, that:
(a) you have violated any part of this Agreement;
(b) we have stopped offering the Riot Services in your region; or
(c) doing so would be in the best interests of our community, the Riot Services, or the rights of a third party.
We may make such determinations, among other ways, by using automated systems and machine learning tools.
Now scroll to the bottom of the Terms:
**YOU HEREBY ACKNOWLEDGE AND AGREE THAT YOU HAVE READ AND UNDERSTAND THE FOREGOING AGREEMENT, AND THAT BY SELECTING THE “ACCEPT” BUTTON BELOW OR OTHERWISE USING OR ACCESSING THE RIOT SERVICES, YOU ARE AGREEING TO BE BOUND BY THE TERMS AND CONDITIONS SET FORTH HEREIN. **
Basically, you are arguing against something you agreed to when you decided to play the game. Perhaps you should take some time to read the terms and decided whether League is a game you should be playing.