Surely it is the PATTERN of some MNers posts that is significant?
IonaMumsnet commented this thread;
www.mumsnet.com/Talk/site_stuff/2091901-Can-we-talk-about-the-giant-loophole-in-the-talk-guidelines-please
That;
"It is very difficult to tell sometimes what is a VERY general 'you' as in 'you, the rest of the world' or 'you lot on this thread' and what is a veiled insult at a particular poster. It's often more obvious to longstanding MNers who are regulars on certain boards than it is to us."
And there is something of the same at play here.
The MNer in question seems drawn to threads on certain subjects (Lone parents, Carers, Disability, Children with SEN, Benefits, SAHMs, Unemployment) She is very very keen to tell us she has no personal experience of any of these things but she is nevertheless attracted to such threads like a moth to a flame where she never fails to systematically put the boot in to parents coping valiantly in sometimes tough circumstances.
That is why MNers who are interested in those subjects have a clear picture of her MO but some other MNers (see upthread) have never heard of her. It is also why MNHQ, moderating on a post by post basis, fail to see the egresiousness of what she is doing.