Well sure there isn't a physical thing like class. It's just an abstraction that we as humans came up with but I like the idea of owning (not indebted) a home, which to me signifies middle class. This is mainly because it gives you a lot of sovereignty. You can choose not to work continually, if the market doesn't pay a fair rate. You expenses are relatively low and controllable, since you don't have taxable income and you can survive, even retire in this ideal society.

These days that's very difficult with inflated asset prices, fiat currency, property taxation of the common people and things like that.

Yes my definition isn't anymore or less true then anyone else's because class isn't something that exists, but personally this is how I see it. I only think in terms of working class when it comes to labor law versus business and stuff. It doesn't have much use to me outside of thinking about workers rights. Most more left leaning people that I'm aware of these days don't particularly care about workers and stuff much these days. They care more about things like welfare or equality which to me isn't really a working class issue so much as a low class issue. I'm not anti welfare by any means. I just don't think I have every heard like an American Democrats professional or not, advocate for giving workers time off, or protecting their wages from excessive taxation or forced profit sharing or anything like that.

America isn't a right wing or left wing system. Democrats are mostly right wing and mostly liberals, they are also hard capitalists. The Republicans are mostly alt right and borderline to full blown Nazi. Workers come nowhere in the equation of political parties or the average worker. Most democratic and Republican voters seem to be mostly interested in building a massive surveillance state, rent capitalism via high taxation on the poor and low taxation on the rich, controlling each other, controlling speech and ideas. This is what most Americans for the past few decades regardless of party has found important enough to vote in. If you want someone to care about the working class you will probably have to somehow get your average American to stop being obsessed with spying on everyone in their society first because that is way higher on your average voters priority list.