A blog post by Alistair Roberts, as curated by Steve Sailer. (Steve's version is shorter and more targeted; the original blog post is the fourth in a series on triggering and suffers for its reliance on the particular issue.)
It seems like a very useful dichotomy, and strongly reminds me of Ask and Guess.
Yes. Either that, or it empowers martinets to come up with petty etiquette norms and declare that someone's approach is "rude" or "trollish", regardless of their actual merits. This is especially ironic when the debate itself involves important issues in ethics, empathy or similar: the person with the most ethical or empathetic position in the debate can nonetheless end up being silenced.
Can you provide an example?