When (enough of) the people who benefit most from a system that's already biased in their favor unironically tell the folks on the far end of that benefit curve that they just need to work harder, they had the same opportunities as anyone else, it's their own fault, or whatever, I don't think it's terribly unreasonable for the people on the receiving end of that "wisdom" to develop a general sort of resentment for their "betters."

"Of all the preposterous assumptions of humanity over humanity, nothing exceeds most of the criticisms made on the habits of the poor by the well-housed, well-warmed, and well-fed." — Herman Melville

EDIT: Phrasing.