I agree that the language used around wp is ineffective.
For me, it was so telling that the women who wrote one of the most famous articles on wp - Unpacking the Suitcase - was an incredibly class-privileged woman. Elite, really. A very wealthy family, an elite education - and mc white women who've only just discovered racism exists can't wait to throw her terms and examples into the faces of those whose world is nothing like Peggy Mackintosh's.
Class can intersect with race, just as it does with sex and with disability and homophobia and ageism...yes. There are many poor black families, for example, who suffer on account of racism and classism.
But it's funny an effective answer would seem to be socially-economically privileged whites insisting that the poor white family recognize their racial privilege.
If the issue is structural, and material, then it needs to be solved at that level, not at the level of rich progressive whites viewing themselves as a combo of white saviour/interrogator.
All the online posturing is worth very little.
I'd challenge white Mumsnetters to put their money where their mouth is instead. Find a Black organization that aligns with your values. Donate a week's pay. Worth more than shouting 'wp', would have an amazing effect on those orgs ability to support Black people.
I know ppl will complain - corona, recession, low paid blah blah. And some ppl are truly too poor to give any cash away, let alone a week's wages.
But some of us (low paid, partner lost job due to virus) did do that as a statement of solidarity with our Black and brown siblings.
Or, you know, I could have spent the last few months pontificating on social media about my white privilege.