Bohemians, hipsters, punks, no-good hippy beatniks, whatever. The terminology is honestly rather secondary to the substance.
Yes, Orwell could be an out-of-touch old fart at times. What's your point, exactly? I'll remind you that the Spanish anarcho-syndicalists, for whom he expressed nothing but admiration, ended up as being very much an example of what I'm talking about. (Their women's section was headed up by a lesbian poet, ferchrissake.)
Edit: Also, do you actually have any particular reason to believe that the "hipsters" in question are predominantly "middle-class", in what I assume is the British sense of the word, the American sense meaning "not actually poor", a far less exclusive category. It seems to me that you're approaching class a cultural genre rather than as a meaningful sociological category; presumably the same logic that allows Tories of your sort to hail obnoxious petty bourgeois like Stephen Yaxley/"Tommy Robinson" as meaningfully representative of the "white working class" because he sometimes drops his 'aitches.