Toxicity outside of summoners rift

Of course, I also mean HA and TFT but I couldn't seem to find an answer to if toxicity is allowed anywhere else outside of in-game. By that, I mean pre-game lobby with duos or others or even private messaging. Naturally, I assume adding someone after the game to call them something like the n-word and then tell them to kill themselves is surely bannable but what if you are messing around with friends and calling each-other random slurs. Can that get you banned?
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