I guess this refers to my post here. I felt I was being nice giving a hint about where to look for an answer instead of just asking re-posting an unrelated question in a new topic. It is useful to know that this may have sounded rude. I’ll try to hit a better balance between brevity/rudeness in the future.
Posting a code of conduct document might be useful, but I’m not sure how many people would take the time to read it; especially if it was such a good, thorough one like the GitHub document linked above. I would expect that direct feedback to potentially offending posts would be more effective: the person who answered would know that he needs to improve, and person who asked would know that there are nicer people on the forum.