This is for Public Press. Extreme profanity is extreme profanity. In other words, calling someone a name might be part of the game for some people. As you say, Diplomacy - and war - can often be a mental exercise. It may be that one player may want to antagonise another on purpose. That's fine and has been around for a long time in Diplomacy.
There are also times when one person will use a word which another might find offensive. It may be part of the 'natural' language for one person but not for another. We're not trying to prevent people from being offended; if I'm offended by being called a name, then I'm probably playing the wrong game.
What we don't allow, though, is when this is an extreme personal attack. In other words, if I post in public press an extreme personal attack, or if I simply post using a string of profanity or obscenity, that is not necessary. It is beyond trying to wind someone up.
Not everyone is going to agree on what is acceptable and what isn't. We don't want someone who doesn't get on with another player going over the top with their language to be extremely offensive; neither do we want to sanitise the game to make it only acceptable to call someone a 'ninny' (for instance).
However, the proposed new rules (which aren't yet in force) say:
6. Posting Inappropriate Content in Public Press. Posts made in a game’s Public Press may not feature any of the following content:
- Racism;
- Overtly sexual or sexualised material;
- Content which express hatred towards sexuality, sexual orientation or gender;
- Threats linked to actions off- or on-site;
- Extreme profanity;
- Abusive personal attacks on members of an extreme or defamatory nature;
- Posting other people’s personal information;
- Spamming;
- Advertising;
- Any accusation or discussion of potential cheating by active players in the game.
Posts which, in the opinion of the site’s management, contain such content, whether in text, images, GIFs or other forms, including links to content which is prohibited, will be removed and appropriate action taken.
NB1: Casual obscenity will not be acted upon – Moderator decision.
NB2: Mild personal abuse will not be acted upon – Moderator decision.
NB3: Content which contains illegal material of a sexual nature or which promotes illegal activities will result in a permanent ban from the site.