I'm. That's one of the primary reasons why I'm still working on my startup (personalized social news site) even though the odds are stacked againts it.
Please help us create a community where people can exchange stories and opinions freely while still maintaining the quality of personalized "front page".
The problem isn't disagreement - it's not developing ethos, pathos, or logos into the appropriate argument. The more controversial the opinion, the more that one must work to develop these three qualities, rather than depending on just one.
I also work to expose the weaknesses of my own argument, admit them, but explain why they are superior to the more conventional alternative.
I find that when this fails for myself, it's often because my perspective is lacking, and I need to rethink my argument.
On reddit, I'll still usually find an unpopular opinion at 3 or 4 points. There's likely some downmodding done, but most people will leave it alone if it's a proper argument.
(Some arguments, of course, are out of bounds. The emotional appeal is too strong. Abortion in a pro-life forum, for example. I haven't had that problem in most major forums.)