I think one thing to remember in the "I was standing there by myself" I believe beyond a point in Diku certain level imms see all says and tells. So while you may be "Alone" you could be spamming several people out with the language.

To be honest I feel the player had more than a fair chance, my break point for bad language happened 2-3 years ago.

I got slayed, purged, and docked 1000 imm exp, and I 100% agree with the decision made by the imm and would expect no less if I did the same again. Given the warnings given this whole thing to me has completely blown out of proportion.

http://www.carrionfields.net/helpsearch.php?keywords=language

LANGUAGE PROFANITY PROFANE FOREIGN OBSCENE OBSCENITY (1152)

Carrion Fields is dedicated to providing a pleasant gaming experience to
all of its players, regardless of their background. Some of our players
are minors, and others have varying sensitivity to obscene language.
Experience has taught us that such language rarely adds to roleplaying,
and often detracts from it. As such:

1) Language which denigrates people of a particular real-life race,
ethnicity, religion, sexual orientation, etc. is unacceptable.

2) Excessive use of profane language describing sexual or excretory
bodily functions is also unacceptable, particularly when directed at
specific individuals.

3) Sexual harrassment will not be tolerated. If both parties do not
consent to the speech/socials/emotes, then don't do them.

4) You may NOT speak in a foreign or made-up language. This is an English MUD
and all communication forms, on all channels, will be English.

As with all rules, enforcement is subject to the judgement of the Immortal
staff, and failure to comply with the above may result in punishment,
including denial of the offending character.

For guidelines on In-Character language, see SPEECH.