Each MUD you visit will have its own distinct character and set of social rules for moderating behaviour.
Some places are very formal and others are anarchistic.
Avoid being rude The MUD is worth participating in because it is a pleasant place for people to be. When people are rude or nasty to one another, it stops being so pleasant. The participants on the MUD come from a wide range of cultures and backgrounds. Your ideas about what constitutes offensive speech or descriptions are likely to differ from those of other players. Please keep the text that players can casually run across as free of potentially-offensive material as you can.