Negative Attitude

Right, question. What does "Negative Attitude" actually consist of with regards to report criteria? Apart from being one of the dumbest things you can be reported for in my opinion, I just got reported for it despite not talking at all throughout the entirely game AND winning with the team I was on, playing with them, not a single person complained. Yet post game, thaaaat comes up? Lel wut. Explain please?
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