I agree with this to the point that my own anti-class warrior is bored rigid with the narrow, prejudiced assumptions so often attached to social 'class', and which are trotted out with tedious regularity on MN.
'Middle class bohemians' is obviously a contradiction in terms. It's an aesthetic, like Dark Academia and Cottagecore are aesthetics: nothing more than that. The actual bohemians were skint. There isn't much that's cultivated about being a precariat. They often lived 'off grid', eked out a sporadic living, and in doing so earned the scorn of the establishment for daring to dabble in intellectual pursuits beyond their 'station'. (Note E M Forster's poor working-class intellectual, Leonard Bast, who is done to death by a particularly aggressive bookshelf. Symbolic or what)?
Right now, looking at this thread, similar attitudes seem to have prevailed. Artists are 'bohemian' by definition. To a lesser extent, so are those who work in the arts, or the cultural and creative industries. To selectively paraphrase some of the posts upthread: such people 'think they are better'. They are contrived. They are carefully cultivating an 'image'. But hey, 'real' rich people 'don't have to care what others think, because they are '"confident"'. I've rarely read such a prejudiced bucket of snobbish shit. Anyone can be confident and say 'screw you' to what others think. It doesn't take 10 generations of 'gentle breeding' to develop your own mind.
I'm a writer (professional) and artist (amateur). I was brought up in a house with piles of dusty books. I became an academic. I get a new car once about every 6 years, and I drive them into the ground. Growing up we attended opera, ballet, art galleries, and theatre. I rode. I spent time out in nature, being taught all the birdsong, flora and fauna my grandfather knew (he knew a lot).
My folks were in trade. We're solidly working class.