I know this might be difficult for some of us in this community, because we have our "tact filters" installed backwards when we were built at the factor....
If this were a face-to-face conversation, and someone expressed disappointment with another person's decision making, the person receiving the complaint could easily be genuinely sorry that the decision made the other person unhappy and trying to express that. If you could see Mo's facial expression, body language and could hear the tone of her voice you could know whether or not this was meant as a genuine attempt to show either sympathy and/or empathy.
Text as a medium is very difficult when it comes to handling emotive language, or the things you humans call "feelings". It's very difficult to know for sure if the person making an emotive statement is doing so in a genuine fashion or is being patronizing or dismissive. Its just as easy to read both sides of the conversation as trollish regardless of either person's intent.
Unfortunately we tend to project our out state of mind when we read these sort of conversations. If we are angry or upset, we will read responses as if they were intended to be angry or upset. We don't of correlating tone and body language context to help us sort it out.
Be wary, and give everyone the benefit of the doubt with regard to emotional intent.