Morning everyone
As you know, we generally aim to keep intervention to a minimum and let the conversation flow, and we don't think there's much to be gained by being too prescriptive on terms; firstly, because our thinking on this is evolving with the public discourse, and secondly because - as ever - context is everything. Our overarching guide in all this is to consider whether posters are treating one another with mutual respect and courtesy; these are the building blocks of a productive discussion.
Broadly, we're unlikely to delete posts which coincide with mainstream scientific orthodoxy. This is very much contingent on tone, however - as ever we'll delete posts which we consider to be disrespectful, goady or a personal attack, and we're unlikely to enter into a discussion about individual posts.
There is debate to be had about the differences between biological sex and gender, and we’re very glad that Mumsnet is a place where folks feel able to do so. We're pragmatic, though - there's only so much time that we can devote to this issue without it impacting on our ability to respond to other MNers who need help, so sometimes we make fairly quick decisions on whether or not to delete. Our best advice, therefore, is to stay resolutely within the guidelines.
Hope this is useful.
MNHQ