There used to be a link at TrekBBS, in the old Rules, to a document called “The Mannerly Art of Disagreement.” It was originally written for the Alt.StarTrek.Creative newsgroup, but I found it an invaluable guide for anyone who engages in discussion, debate, or objective analysis.
Alas, the link to the guide no longer exists.
Perhaps it will turn up someday on the Wayback Machine. In the meantime, I provide it here as a public service: just click on the link at the top of the page. I have referred to it often in my job as moderator at TrekBBS, and I highly recommend it. Thank you, Macedon, wherever you are, for writing it.