I suspect only white British posters could be unaware that Mumsnet is white British dominated! It's not unique to FWR, it's site-wide
Oh I do agree that it’s definitely very white British dominated but to suggest that there ONLY white British women on FWR is often an accusation used to belittle the FWR site and the opinions given there. It’s actually usually has middle class tagged on for good measure.
I do get sickened by the obvious racism shown throughout the whole site being explained away as ‘concern’ or lack of knowledge. The anti NI threads are common too, under the guise of Brexit/Remain ‘concerns’.
I don’t know what can be done to encourage more women from various backgrounds to join in conversations, though. Obviously if a place feels unwelcoming to anyone, they will be reluctant to join and I do think that MNHQ can be a bit slow at deleting the racism threads, which absolutely doesn’t help.