In not especially offended, but it does rub me the wrong way when people make negative assumptions about others, then offer their advice.
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.