Earlier quoted context omitted.
Most working class people die with savings below five figures. You should re-evaluate how good you're doing. Of course, if you live in California or New York, you're basically broke, since the cost of living in those states is designed to keep people poor. But that's why people left those two states in droves over the last few years.
I don't think the parent post was punching down on working class people, but rather making the point that if housing is unaffordable for even someone with a 300k household income, it is truly catastrophic for people on the average wage.
I'm from a working class family myself. My parents were factory workers, and they managed to buy a new 4 bed apartment in a new part of town and raise 3 children.
And yet I don't feel I'm doing materially better than my parents at my age. I definitely don't feel upper middle class even if my income suggest so. As you point out I can't imagine how people with more average incomes get by.