If i play bad in a game and get flamed i don't make it an issue. The flamer just gets a bit rid of his frustration and that's it. Best case he plays better after that.
You get flamed, you declare it a problem and want policing and run arround with that toxic meme. You make it a problem, not the flamer, not me. And realistically when you censor him he will just ragequit the game and make you lose which turns it even worse.
I have no interest in your censorship demands nor in players fucking up my game when you make it mandatory for everyone. This is why I'm even writing. If you have a problem with it deal it on your own but don't try to drag everyone into it.
You can find of course sensible practical reasons to ban topics like people having no desire to get real live problems into the game i.e. politics but it doesn't absolve that decision against your original ideal if you held it. You're compromising your original values for convenience at that point.