I don't know whether, as stated, that's true. That begins with talking about "culture" with our rightards to always include scare quotes, as they have very little grasp of what that actually is in the West - beginning with their usually brutal treatment of that culture's very foundation, the English language - and next to none regarding the Middle East.
Looking back into history, we watch "Western cultures" creating their wealth and developmental opportunities on the backs of brown and black peoples, by way of exploitation either directly or through "resource extraction", ranging from slavery to oil, and manipulating or enforcing conditions favorable to this exploitation and extraction "over there". So, in a way, what we created were mirror images of our predatory nature, from India to the Middle East to Africa, usually leaving utter destitution and tin pot dictators, not to mention ethnic and religious strife, in our wake, and to this day saddling many of them with the "resource curse". When the Britons started to take over India, the country accounted for 25% of the world's GDP. When the Britons were thrown out after WWII, India, Pakistan, and Bangladesh, mired in interminable strife, combined accounted for less than 1%. We taught them "civilization" good and hard.
Arguably, based on the immense wealth extracted from brown folks, "Western cultures" escaped their backwardness once they resolved, not without screeching resistance in the form of predicting doom and destruction, to grant woman self-determination, against Christian worthies at the forefront of the most indolent counter-revolutionaries, and to give lowly workers a seat at the table. At the time when the West underwent that transformation, the rest of the world was under the West's thumb, poor, oppressed, and destitute, and deprived of the ingenuity and civilizing influence of women, and neither the time, energy, and self-organization to make that transition.
Unsurprisingly, what our rightards set out to do most, knowingly or not, is to remove these two pillars of the West's standards, with nothing ranking higher on their list than making life as hard as possible for those "down there" - no health care, no food stamps, no union representation - and showing women their place - also down there - not least in the form of reduced or eliminated reproductive self-determination.
So, if we are to determine "backwardness" elsewhere, that's not what "Deplorables hate"; rather at its foundation it's exactly what constitutes every good rightard's wet dream.