I can sympathise with the frustrations of non teachers on mumsnet and in the world in general, to be honest.
'Teacher talk' easily takes over all other conversation and, as a group, I find we talk about work outside of work in a way that other people don't seem to. I'm not talking about teachers who work in the same school, either. Just knowing that another person is a teacher of any kind, anywhere, seems to be enough, in my experience.
There is also a tendency towards martyrdom and a belief that we have it harder than anybody else. Both pre Covid and now. Alongside that, there exists the belief that teachers finish at 4pm and are always on holiday. One of those stereotypes almost certainly leads to and perpetuates the other but it's impossible to say which came first.
In Covid both attitudes have become so much more extreme. We now see lots of teachers claiming to be 'on their knees', 'permanently exhausted' and 'thrown to the wolves' which I just haven't seen from doctors, nurses, police etc on here.
At the same time, there are more posters insisting even more vehemently that teachers do nothing but whine, want schools closed forever and are workshy.
No idea if one type of posted started due to annoyance at the other type or whether they are independent of each other but I can absolutely see why both attitudes are infuriating to the other 'side'.
And, as is usually the case, few of the extreme views are valid and most people exist quite happily in a realistic, mid way world which could probably be summarised like this:
Teaching is a hard job. It is not the hardest job. Covid has made teaching harder. Covid has made lots of jobs harder. Most teachers love children, love their jobs and work very hard. Some teachers hate their jobs and want to quit but still work very hard. A few teachers are terrible at their jobs. The last 3 sentences could have any job title inserted into them and still be true. Teachers are normal people with a normal mix of good and bad traits.