“As for those anti-imperialists who don’t participate in this festival of xenophobia — and here I include myself — we have our own elitist consolation: we accept the tragedy of masses of gullible sheeple falling for cunning propaganda because having overcome it flatters our own intelligence. The more we condemn society’s stupidity, the smarter we feel in comparison.”
- Masses, Elites, and Rebels: The Theory of “Brainwashing” (2022)
Roderic Day, 2022-05-23

Ultimately, you’re identifying the upper stratum of the proletariat (including office workers) as their own class. I agree that they form a subgroup that shares similar characteristics, including taking more to convince of the necessity of socialism, but ultimately they do engage in proletarian relations. They are ultimately bribed by the spoils of imperialism to inflate their living standards, but as imperialism crumbles, through no changes in their labor relations, will necessarily fall into immiseration with the rest of the proletariat. This is why class is not the same as income or wealth, but that those are often correlated.
The closest analogy I can think of is Malcom X’s words on house slaves and field slaves.
– “Malcom X speaks” p. 10-11
I hesitate to directly equate chattel slavery to comfortable white collar westerners, but it seems relevant to the question of why wealthy proles would act against their own class interest. There is this brain-worm burrowed deep that shouts “Where is there a better house than this?”, “Where can I eat better food than this?”, “Where can I get more treats than this?”.
Indeed, this substratum of the proletariat is often correctly identified as the labor aristocracy, but their relations of production are ultimately proletarian and thus they are further immiserated by capitalist decay. It will take longer, but they are not a distinct class.