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Wlk777, well, generally speaking, it's acceptable. Imagine you wrote, "Volka is an idiot and doesn't know how to play, and he's just talking nonsense" - let's say for you, it's a joke, or maybe you could only express yourself that way because it's the only way you can make yourself understood. But for someone who isn't aware of your particular style, they might take you literally, and what's the point of trying to understand the nuances?
In general, users already have a lot of freedom of expression compared to moderators, but it would be good to respect the boundaries, although I understand that sometimes you just feel like calling someone an idiot, even if it's true:)(this isn't a hint:))