Agree with PP's talking about relativity.
200k is loads (more like 100k after tax) if the average family home doesn't cost 850k (talking a three bed flat, not a semi with a garden and somewhere to put the car.)
So move somewhere cheaper. Absolutely, but then you are looking at 12k annually in commuting fees, assuming you can walk to your station. If not, add 1k to your commute time, assuming you can co-ordinate so everyone can get where they need to be at the right time using one car.
Yes. School fees, foreign holidays, posh cars and clothes etc are all optional.
Thing is, many of us were taught that if we worked really really hard and got ourselves 100k jobs we'd be absolutely laughing. Once upon a time you could be a doctor or a senior manager and have one parent at home (if you wanted), a nice house, all the bills paid and a nest egg for the future. Houses were realistically priced so they were an appropriate aspiration.
Now, the south east is so preposterously expensive you have to be in a crazy income bracket to manage the standard of living available for most of the previous professional generation.
So leave the south east, and do what? The majority of high paid jobs are still south. How long this will continue, when people can't afford to hire decent staff because they in turn can't afford to live in the capital, is any ones guess.
She is being crass, she hasn't a clue what it's like for the rest of us, but I get that she feels a bit short changed.