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Depends, I take the game wayyy too seriously and all I think about is the VICTORY sign in the end screen, And in 8 years of playing league I have found out that the best way to achieve that is to follow this pattern:
in 90% of the games don't even say a single word, disable all chat
in the other 10% only talk if you have something really funny and cheerful and positive to say.
never ever report anyone and always Honor whoever you think did the best.
You might be surprised but Riot matchmatking algorithms are so complex these days that it will start matching you with people not only with similar skills.. but with similar personality as described above. it's been years since I've had rage quiters or toxic / afk people in my games.
This kind of positivity also cheers me up in real life after I am done with the game