£50,000 isn't much in London.
Well yeah, I doubt a family in London with a household income of "only" £110k are looking at private schools and buying a 2nd home either.
Ultimately I think the point of the detractors is that the Telegraph have tried to craft this mythical 'average' middle class family to make an alarmist point and it looks a bit silly because the vast majority of UK voters (even in the middle classes) aren't actually affected by some o fthe tax rises they've listed.
Your overall comments on high taxation and the waste of it are a separate matter, but not unwarranted.
