Where is the line between being working class and not?

When thinking about where does the working class stops, it’s usually about people like engineers, doctors, upper middle management who earn way more than the median income, have some saving, and tend to benefit from “right wing policies”. However, it’s people who would need to cut-down their lifestyle if they work-less, it may not be as drastic as blue-collar, but they’ll need to work to preserve their quality of life.

When people have huge income, enough saving to make a “passive income” and could stop working tomorrow without drastically changing their lifestyle, they’re definitely not working class