From one perspective, the history of [Politically Correct English] evinces a kind of Lenin-to-Stalinesque irony. That is, the same ideological principles that informed the original Descriptivist revolution — namely, the sixties-era rejections of traditional authority and traditional inequality — have now actually produced a far more inflexible Prescriptivism, one unencumbered by tradition or complexity and backed by the threat of real-world sanctions (termination, litigation) for those who fail to conform. This is sort of funny in a dark way, maybe, and most criticism of PCE seems to consist in making fun of its trendiness or vapidity. This reviewer's own opinion is that prescriptive PCE is not just silly but confused and dangerous.
Usage is always political, of course, but it's complexly political. With respect, for instance, to political change, usage conventions can function in two ways: On the one hand they can be a reflection of political change, and on the other they can be an instrument of political change. These two functions are different and have to be kept straight. Confusing them — in particular, mistaking for political efficacy what is really just a language's political symbolism ... — enables the bizarre conviction that America ceases to be elitist or unfair simply because Americans stop using certain vocabulary that is historically associated with elitism and unfairness. This is PCE's central fallacy — that a society's mode of expression is productive of its attitudes rather than a product of those attitudes — and of course it's nothing but the obverse of the politically conservative SNOOT'S delusion that social change can be retarded by restricting change in standard usage. [
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Forget Stalinization or Logic 101-level equivocations, though. There's a grosser irony about Politically Correct English. This is that PCE purports to be the dialect of progressive reform but is in fact — in its Orwellian substitution of the euphemisms of social equality for social equality itself — of vastly more help to conservatives and the U.S. status quo than traditional SNOOT prescriptions ever were. Were I, for instance, a political conservative who opposed taxation as a means of redistributing national wealth, I would be delighted to watch PCE progressives spend their time and energy arguing over whether a poor person should be described as "low-income" or "economically disadvantaged" or "pre-prosperous" rather than constructing effective public arguments for redistributive legislation or higher marginal tax rates on corporations. (Not to mention that strict codes of egalitarian euphemism serve to burke the sorts of painful, unpretty, and sometimes offensive discourse that in a pluralistic democracy leads to actual political change rather than symbolic political change. In other words, PCE functions as a form of censorship, and censorship always serves the status quo.)
As a practical matter, I strongly doubt whether a guy who has four small kids and makes $12,000 a year feels more empowered or less ill-used by a society that carefully refers to him as "economically disadvantaged" rather than "poor." Were I he, in fact, I'd probably find the PCE term insulting — not just because it's patronizing but because it's hypocritical and self-serving. Like many forms of Vogue Usage,[
41] PCE functions primarily to signal and congratulate certain virtues in the speaker — scrupulous egalitarianism, concern for the dignity of all people, sophistication about the political implications of language — and so serves the selfish interests of the PC far more than it serves any of the persons or groups renamed.
On point even today (social justice mov't, privilege, trigger warnings etc etc). 
