Who to blame? The guy going AFK or the rest of the team for making fun of him?

During my first Ranked of the day, our lucian died 1v3 under turret with 1/4 hp. Syndra mid and akali Jgl started saying "so bad, worst lucian ever" "get out of this game" etc. He RQ at min 9. Surely enough we lost. I had to report all three of them because even tho RQ is not acceptable, what is the point of shaming someone and even be happy when that someone leaves? What would u have done in my place?
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