There should be a way to report people who kick you unfairly. I was doing the Oryx challenge and got kicked right before we beat it for no reason. The person who kicked me then deleted me, so I can't report him in game. There should be a way to report people who aren't on our friends list, or some of us will resort to name and shame because that's the only option right now.
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Report them for being "Unfriendly"