I floated the idea of a thread for practicing productive disagreement techniques on this Double Crux post and was modestly upvoted, so I'd like to try it. But first, I'm going to explain the format I have in mind and see if anyone has objections/improvements.
Proposed Disagreement Thread Rules (Discuss these, don't follow them yet)
Discussions are to be one-on-one.
The default platform for discussions will be the comment thread, but participants can use others at their discretion, such as instant messaging platforms or maybe even video chat. Try to keep a shareable record so others can potentially learn from it.
It seems useful to have default options for these. Preferably anonymous and zero-setup. deadsimplechat.com looks reasonable for this.
To participate in the thread, either
make a top-level comment listing beliefs that you think might generate productive disagreements, as well as any preferences you have about discussion format,
or reply to someone else's top-level comment, selecting one of their beliefs that you disagree with. Don't make any arguments in this reply, just say which belief you're selecting, and what platform you'd like to discuss it on if the top-level commenter gave multiple options.
The top-level poster and the replier then conduct their discussion in replies to that reply, or in the agreed-upon outside platform.
Inflammatory topics are better discussed out-of-band. When listing a topic you think likely to be inflammatory, flag it as such and don't offer in-comments discussion as an option.
If this becomes a recurring thread, different techniques might be highlighted in different iterations, but for the first one participants should try to use the double crux technique.