It can depend on the wording of your post. It needs to be full of caveats and you just have to cover every single potential conclusion that posters will potentially come to, or you leave yourself wide open to wild accusations and character assassinations.
A long time ago, I posted about how a male colleague had done something to make me feel very uncomfortable, and, based on my wording, I was accused of being prudish and one person said that I 'sounded Amish'. Looking back, the colleague absolutely was bang out of order and other colleagues have continued to tell me the creepy things he has said to them.
Another time, I wrote on AIBU about how a female relative completely ignored me when I was staying with her and was very ill. I had covid and she didnt so much as leave a glass of water outside the bedroom door for me and just acted like I wasn't there. I was so weak I was asking my 6 year old to fetch me a drink. Because I directed my hurt towarda the female relative, with whom I had thought I had a good relationship with up to this point, and not her husband, with whom I had no real relationship to speak of, I was accused of being sexist and of perpetuating patriarchal views that women need to be the caregivers.
Mumsnet has been incredibly supportive through the years but I have read, and been subject to, very strange narratives that form based on the initial perception of the OP.
I think that Mumsnet is huge and there is a real cross section of absolute weirdos who enjoy extrapolating strange things from an otherwise innocuous OP. Anyone posting needs not only a think skin but also a very discerning sense of inner judgement because some replies are nuts.