It's not happening here, but: I really really don't understand people who get offended by "unsolicited" advice. Chances are it's coming from a place of honest care and concern. Just ignore it if it doesn't pertain to you. When you get a strong reaction from someone in response to unsolicited advice, I find more often than not it's actually striking a chord and probably more needed than the person realizes. I'd want that feedback whether I solicited it or not, personally.
To me it comes off as condescension, not actually help. If they wanted to help or cared, they would seek to understand first. Unsolicited and more importantly uninformed advice shows a disregard for the recipient.
It reminds me of legal advice threads where people give terrible advice because they are too busy speaking to even read the original post.
Re-read Lumost post, and then em-bee's unsolicited diagnosis and advice. They are absolutely making assumptions and suggesting a narrative about an uncollaborative and deficient marriage.
At the end of the day, people are free to post what they want, but having some community standards is what prevents things from devolving into rabble and insults.
For my part, I want to use that freedom to tell people that it is unproductive and generally considered rude to make unsolicited, uncharitable, and uninformed assumptions about the marriages of others. Moreso, because I think are giving out factually bad advice.
Perhaps you should respond to the factually bad parts, because that's actually debatable. Leading with "that's rude" is a personal sentiment and all it takes to rebut that is a "no, it's really not".
Similarly if you’re finding yourself prefacing comments with “No offense, but…” just don’t say them. Offense avoided.
The comment to which you're replying makes some good points and isn't finger-pointy, and is more suggestive of potential gaps to fill. Any long-term relationship requires hard work, and so advice is often a helpful reminder of this, whether the advice is good or not it can trigger a re-evaluation of perspective; a view from the outside of what may have become taken for granted from the inside.