I think middle class means that at least one person in the household has to to work to pay your bills, and you have at least enough wiggle room in your budget to contribute up to the match in a 401k. You can splurge occasionally on luxury items, but not very often. Some people in this “class” live paycheck to paycheck or in debt because of their bad choices, not because they are Poor.
Poor: either not working due to no jobs hiring in an economically depressed area or for some other reason (disability, for instance) or working a ton (extra shifts, second jobs) to try and make ends meet. Either way, living paycheck to paycheck, unable to save anything. Not exactly sure how you would make it in an emergency situation if you got sick, or if your car broke down, etc.
Rich: anyone who is able to max out a 401k. Or if you retired early and don’t have to work because your investments work for you.
Filthy Rich: first class flights, champagne brunches, golf membership, designer shoes and handbags, attend charity galas, personal chef, personal trainer, maybe you own a horse or a sports team, etc etc.
I think the disconnect is that people who are Rich don’t *feel* rich, because they compare themselves to the Filthy Rich. So the Rich think they are Middle Class.