Maybe it's because I was born and raised in pretty extreme poverty in a rough as fuck area with a pretty chaotic and neglectful home life, and now live in relative financial comfort, surrounded by fairly affluent families, and have pretty much lived through all the in between stages too, but I don't find much shocks me on Mumsnet.
I used to live with and beside people who ate only frozen - farmfoods and iceland, or sometimes a chippy, wouldn't have thought to cook anything other than mince, and kids were allowed unlimited fizzy drinks and lollies, none of my family members or neighbours drove and the very occasional family who had a car were 'rich'. About 60% of the adults I knew (including family) didn't have a job, and the 40% that did worked in 'the factory', a shop, the buses etc, arguments on buses, and fights in the street were commonplace, and that was totally normal to me.
I've also lived beside people whose houses were like show homes, shoes strictly off, all meals cooked from raw ingredients, children under four not allowed fizzy or sweet things except maybe cake at someone's birthday, everyone had not one, but two cars, and teenagers were coached to have their license within a month of their 17th birthday. Everyone owned their own homes, and worked in highly paid professional positions, unless of course you were a SAHM, and that too, seemed normal to me at that time.
I, now, personally mostly cook 'from scratch' but we have the odd jar/oven chips. My kids really only do drink water, except if we eat out when they're allowed lemonade (my eldest is 13) We restrict screen times, I mostly drive the kids places through a combination of safety and convenience because most places are difficult to get to otherwise. The people around us are a mixture of renters and home owners, some people expect us to take our shoes off on entry, others don't. We have friends who are more, and less strict when it comes to food/kids drinks/screen time etc. Again, this is totally normal to me.
Oh, and I do suffer from diagnosed depression and anxiety, as well as ptsd and complex trauma syndrome, so I have complete sympathy for mh issues, but do think that 'I have anxiety' gets bandied about a bit too easily.
Anyway, maybe it's not normal to think like I do, but there are very few things I see on Mumsnet that I find all that out there or shocking. Everyone's life is very different.