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Treating other users properly
Sure, all of us play the "Real Life" game. We all hear words used by other people that can be offensive (also known as insults or cussing).
Though it may be acceptable among some other wikis and when hanging out with your friends, doing such is not acceptable here. If a user insults or cusses at another, that constitutes as a personal attack, and has a high chance of resulting in a block.
While jokes made by users are usually in good fun, jokes that can be considered offensive should be avoided. If a user continues to say disrespectful jokes after several warnings, he or she will be subject to a block.
Not all insults have the same magnitude. If you tell somebody that they suck, it is nothing like calling them a racial slur. The more minimal things, like "noob", "suck" and such, would only result in a warning at first. Though, more inappropriate words and/or racial/sexist slurs can result up to a month or two if it is insulting enough.
Don't feed the trolls
A troll is, according to Wikipedia's definition, "someone who posts controversial and usually irrelevant or off-topic messages in an online community, [...] with the intention of baiting other users into an emotional response or to generally disrupt normal on-topic discussion."
It is understandable to not like editors who purposefully disrupt the wiki. However, from unregistered users to trusted bureaucrats, no one has the right to personally attack vandals or trolls. No matter how much damage the unconstructive edits or flame wars may have caused, all that is necessary is to block the user and move on. Attacking such trolls or vandals is fruitless and counterproductive; doing so will usually encourage them to come back for more.
Don't be a jerk
When participating in community discussions or conversing with other users, never go out of your way to intentionally irritate or attack other users. Doing such can be considered a personal attack, depending on the circumstances. Purposefully inciting conflict and thus causing a flame war is counterproductive and might result in being blocked. In addition, when making a point in a community discussion, do not illustrate your point in such a manner that is detrimental to the wiki. Make your point, but never go overboard in doing so.
Don't bite the newcomers
Users new to or inexperienced at editing on wikis or just this wiki are often unfamiliar with how policies, guidelines, and other important aspects of the wiki function. Regardless of the quality of the contributions, it is important to remember to assume good faith with new members. As Wikipedia says, "nothing scares potentially valuable contributors away faster than hostility." Remember, at one point, we were all first-time editors.