Not sure about the “man up” bit, Lucy!
If someone starts a thread with genuine, pleasant intentions and then others make less than kind comments, I think most people would be at least a little peeved and probably annoyed/upset.
Too many people feel the need to boost their own self-esteem by bringing others down, conveniently hiding behind the anonymity of the internet.
Some would call it cyber-bullying …. others would call it cowardice ….