Why do players even care about the FLAME?

https://pbs.twimg.com/media/B3lW2GICQAAGfiX.jpg Why do you care about flame? It is hard for me to understand, because if someone tells me I'm shit, I usually think "Oh well, I have been horrible this game, I should get my shit together and focus more." and then tell my team "Sorry, I'll try to play better.". And if the flamer is just mad I mute him and the flame disappears. I don't even need to report anyone.
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