Once or twice in my wiki-career, I have told another user to fuck off. In each instance there have been several who felt the need to tell me what a bad idea that was, that it didn't help, that it was uncalled for, etc. I don't make a habit out of telling people to fuck off, I only do it when they've really earned it. I deal with the real world, I don't live in the fantasy world some Wikipedians would have us believe in where no matter how ridiculous someone is acting we all have to talk like kindergarten teachers lest somebody be offended. In each case of me using this term the circumstances were as follows:

  • The other user and I were in some sort of dispute
  • I had tried to break off discussion with them as it was not working
  • They persistently posted to my talk page after being asked nicely to stop doing so
  • I told them to fuck off

If that seems wrong to you, then you probably haven't worked a job where you deal with the general public. I have. Sometimes you have to tell somebody that they are too drunk, too loud, too angry, or whatever, and that they need to leave. Usually they feel suitably embarrassed and they do leave without any further fuss. Sometimes they would rather argue about it, embarrassing themselves even further with their inability to understand that they are acting like an ass. That is when it becomes appropriate to resort to using strong language. It has its place and purpose and anyone who thinks it's absolutely never acceptable is free to not use it themselves but should not try and enforce that draconian prohibition on others or endlessly berate them when they do use it.

That being said, don't do this

I really believed in this for a long time. I still believe in the underlying principle, but let's face it: Wikipedia is not a bar, even if people do edit while drunk at three in the morning. What is entirely appropriate behavior in one context may (in this case absolutely will) be seen as entirely inappropriate in another context. Doing this will only change the focus on to you for daring to use a bad word. The persistent jerk who prompted you to say it will get to just walk away while everyone yells at you for telling them to fuck off. A better approach is to just remove the offending posts. If needed, find an uninvolved admin to talk/warn/block them.

So fuck off from fucking off, it just is not a good idea in this environment.