I know this has already been mentioned in the PL thread, but I thought it might be an idea to bring it to the attention of mners in a thread of its own.
After the PL debacle, there followed a thread in AIBU about toilet. On which this post appeared...
"I'm with you OP and I'm horrified by the transphobia on Mumsnet. I have done some work with Transmedia Watch who are trying to persuade MNHQ to treat transphobia as they would treat any other hate crime. I don't know what MNHQ have against the trans community or why they don't challenge the widespread belief that trans women are rapists in frocks who want to see fannies."
So, yeah, just letting you know that they are (allegedly) on the case with mnhq.