/mute all is punishable?

So I just uninstalled the game because of the community, I just had enough BS through these BIG 6 years playing League on different accounts. My first and second accounts got banned because I flamed some toxic guys who fed... doesn't matter anymore. The point is, today I uninstalled League because I cannot stand this toxicity anymore. I came here to have fun, not to be insulted by some 12 yo. So, if I mute all at the start of the match, is this punishable? More info would help me a lot, thx!
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