This is a policy on how to treat other users.
Respect other users
No user deserves to be treated with disrespect, no matter the situation. If you have a disagreement do not try to solve the issue with verbal insults or by using profanities. Things said on the internet can hurt someone in real-life. Think before you act. If you are harassing another user you will be blocked for a certain amount of time (determined by previous offences).
Users are not to create "hate lists" (whether for other users to sign stating their disdain for said user or for the user in question to list the users they dislike). They are also not to make polls that gauge their "popularity" (or lack thereof) or polls which are to decide whether their fellow editors wish for them to leave or not. In short, while users are free to use their userpages as they choose, their userpages should not be used to create unnecessary conflicts within the community.
Solving user conflicts
All user conflicts should be solved peacefully. It is better to come to a compromise than to keep arguing. If you cannot compromise then simply stop talking to that user until you can come up with a solution. If you feel that a user has made a personal attack on you, you may report it here and an administrator will take appropriate action.
Edit and Revert wars
If a user is having an edit war with another user, the user should contact the other via that user's talkpage or the article's talk page, and they should make an agreement to stop the war. If the users make more than three reverts to the page, they will have violated RS:3RR, and may receive a block. Revert the page to its original state and refer to the style guide for a solution. If the style guide does not give a guideline for the disagreement, discuss with other users on the article's talkpage and attempt to reach a consensus (compromises should be made if necessary).
If you feel you have been unjustly banned simply state your case on your talk page and let the community determine your situation. If you have been unfairly banned you may be unblocked. If you swear and curse at a user on your talk page the ban will stay in place, or it may be extended to a longer period of time.
Other things to consider
Your actions and statements can be harmful to others. In some countries criminal charges may be pressed for certain threats. Read more here.