Previously, I said to try an experiment using multiple accounts where you post comments with a swear word and slightly censored swearing, versus just posting uncensored swearing and nothing else different. You'll quickly see the relative difference in the community's reaction.

You'll only get voted down for it when the swearing makes it harder to read your comment, or conveys an emotional urgency unwarranted by the thread. For instance: "Fuck you" is unlikely to be well-received in any thread.