I was a teacher.
I've never been a nurse, or a farmer, or an accountant, or a pilot, or a social worker, or...well anything else, bar some student jobs. Nor do I have any interaction most days with any of those people.
So I don't come on here and tell any posters from those occupations what their job is like, how they should do it, or how they should be assessed.
Consequently those posters don't need to defend themselves from me or from other posters, or tell me that I'm wrong about what their job entails.
However, the majority of mumsnetters are mothers, and (rightly) invested in their child's school. But what they see of the school is like the swan analogy. They see the smooth (hopefully) results of the effort that staff put in, but don't know the details of how it all happens, the work, the rules, the training, the finances etc, all the flapping feet under the water. Just like any other profession.
What happens behind the scenes is incredibly complex. To be honest, school staff vary in what they understand of each other's roles. I know my TAs didn't know the detail behind all that I had to do and the reasoning behind it. Many teachers have little idea of what the head has to do beyond what they see her/him do. And there's a massive amount in leadership that we don't see (my late DH was a deputy head, so I did know).
So. There are constantly (and understandably) posts on here where mumsnetters who don't work in schools make posts that include inaccuracies or information that's simply wrong. They maybe have opinions based on misinformation.Teachers then come on to explain that they're mistaken, and suddenly "teachers are moaning again".
I would hope and expect that if I misunderstood part of the role of a mumsnetter in a different profession, they'd put me. But there simply isn't the volume of posts about farmers, accountants, pilots, nurses etc, for that to be noticed or for a whining mentality to ascribed to any of those professions.
tldr: there are lots of parents and teachers on here, and not as many people who are from, or who want to moan about, other professions..