If there are one or two incidents in particular that stand out, and have resulted in you choosing to pull back from interacting on the forum, would you be able to post a link to this so the men can read and reflect on how this was perceived and the effect it has had?
Men: Do NOT argue about whether the incident posted was actually harsh or not, or justified, or misunderstood, or whatever. That would be completely counterproductive, and would just discourage the women involved even more. I expect the ladies will be quite nervous about sharing any specific examples, and the last thing we need is people reacting in a way that makes this worse. Please show them that it is safe to share this by saying NOTHING in response - and that includes private messages (don't start a private conversation with them to try and discuss it).
I'm trying to find out what things the women PERCEIVE negatively enough to cause them to not want to post. As Sarah's said, much of this will be one giant miscommunication, so things being perceived incorrectly goes without saying. The point is that we can read and consider if there are ways we could improve our communication in future.