It contains the advice or opinions of one or more Wikipedia contributors. This page is not an encyclopedia article, nor is it one of Wikipedia's policies or guidelines, as it has not been thoroughly vetted by the community. Some essays represent widespread norms; others only represent minority viewpoints.
This page in a nutshell: Knowing how to "lose" a debate, with civility and grace, is sometimes as important as "winning" it.
Every Wikipedian needs to know how to lose with a semblance of grace and dignity.
We like to think of the Wikipedia community as being infallible, but in the short term, mistakes are often made: A tangent derails a discussion for a much-needed clarification of policy; the community fails to show up and defend itself against poorly conceived plans; an editor's strong reputation or an early knee-jerk reaction prevents a clear analysis of a proposal; an advice page recommends an action well-suited to one problem, while inadvertently creating serious problems in other situations; or emotions run high during editing of a controversial article, and an edit war breaks out.
When you are on the losing end of an argument, remember these things:
Let it go—for now, at least. So what if your ideal improvement can't be made today? If your idea is a good one, it will still be a good idea next year.
Failure isn't the end of the world. Failure is unpleasant, but there are still 6,912,576 articles out there, and 99% of them need to be improved.
Recognize when no means no. Your idea of what Wikipedia should be or do may be completely different from what the community believes. Sometimes "no" means "I don't understand", but more often, it means "we understand, and the answer is still no." If you're in the minority, recognize and remember this fact. Don't continue to press for your desires against clearly expressed community-wide consensus. Doing so will just make yourself look like a child who thinks, "No, you may not have a cookie" means "I must not have yelled 'COOKIE!' loud enough for my parents to hear me."
Remember that it may not be important. When nobody cares, that's a sign that your issue isn't that important to the community. Advice pages need to focus on real problems without providing endless instruction on avoiding hypothetical problems. The change that seems critical to you might seem trivial to others. And even if it seems critical now, it probably isn't the end of the world, and you may look back on it in a couple of weeks wondering what all the fuss was about.