Should wishing death to someone result in an instant perma ban?

I was in a game with Kalista, Fizz, Renekton, Jax and I was Morgana. We were playing against Graves, Thresh, Ashe, Annie and Fiddlesticks. At the start of the game I jokingly said in all chat: "Report Kalista for killing me in the fountain.. q.q" and the enemy Graves immediately responds with "stfu noob, go die in your cringe life", then proceeds to call people on my team trash and dumb for making mistakes. Should the death part result in an instant perma ban?
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