It's best to just roll with it, I think. Follow the guidelines and post as substantively as you can. The population of HN is large and diverse and you're unlikely to be able to figure out why each and every downvote (or upvote, for that matter) is handed out, and even if you could, you may not agree with why they did so or think it’s fair. They can be useful as a guide and an opportunity to imagine how the comment may come across differently than you intend. But at the end of the day, it's the nature of the beast. Use what you find useful and let the rest slide.
