Wiktionary
inverted snobbery
n. A form of snobbery where the practitioner deprecates the target for attributes that would normally be considered desirable (particularly wealth).
Usage examples of "inverted snobbery".
He really must get rid of the inverted snobbery that, with its opposite, is ingrained in so many of the English!
With its inverted snobbery, it placed bankers and busmen at the same long tables with red checkered cloths.
Norman's tone was absent, but behind the words Donald could detect all the inverted snobbery of the modern Afram.
They claim it's to reduce the chances of cultural contamination, but by now I gather it's developed into a sort of inverted snobbery.