A question about game chat

My question is with regard to a four player game.
One of the other three players was playing well, and slowly taking over the board, while the other three of us essentially let him by fighting each other.
I could see that the eventual winner would win if we didnt start attacking him, and tried to get the others to do so, but that didnt happen.
Unbeknownst to me, the winner had given me a poor fair play rating and had posted game chat to the effect that me trying to rally the others to attack him was not fair play.
I'm positive it is fair play, as long as the comments are made in game chat, and not secretly.
Am I right or wrong?
One of the other three players was playing well, and slowly taking over the board, while the other three of us essentially let him by fighting each other.
I could see that the eventual winner would win if we didnt start attacking him, and tried to get the others to do so, but that didnt happen.
Unbeknownst to me, the winner had given me a poor fair play rating and had posted game chat to the effect that me trying to rally the others to attack him was not fair play.
I'm positive it is fair play, as long as the comments are made in game chat, and not secretly.
Am I right or wrong?