In general, I'd argue the correct way to look at this would be from class interest perspective. What it really comes down to is whether your labor is the primary source of your income or whether it is your capital. If you're in the former category then you're a worker and you have common interest with other workers. If you're in the latter then your interests are directly opposed to those of the working class.

Careful about stuff like this. The word "oligarch" always presents some liberal conditions by distancing the fundamental issue of private property from attention. Middle-class people are integral to this system because they have a vested material interest in maintaining property as well as the violence necessary for it to exist; they aren't "oligarchs" any more than the thousands of multi-millionaires are.
It is also contradictory to socialism to attribute systemic inequities exclusively to the actions of select individuals, not a system of power organized around property.
Edit: I'm seriously disappointed by the amount of uneducated mansplaining going on here, I won't be responding to any more comments from this community.
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