Hardly surprising. The comment from the American-Indian in the article says it all. What else would you expect?
Ideas about Political Correctness quite obviously are going to be critically-related to level of education. That's been obvious since the term first became commonplace. It's all about language and having the 'correct' analysis and being able to say exactly the right things (from having read the right books and having the time, space and economic resources to be able to support the 'right' attitudes).
It's been observed multiple time since the 'movement' appeared (decades ago - I remember when UK journalists picked the term up via the internet from the Americans - in an ironic example of cultural imperialism the term entirely eclipsed our own traditional 'ideological soundness') that it's a consequence of the slightly upside-down nature of what passes for the 'left' in the US, and the lack of a mass working-class movement there.
The US left largely retreated to the universities a long time ago, and their specialty has been, as befits university-educated middle-class people, analysing, and attempting to modify, language. They aren't exactly going to be seizing control of mines and factories, are they?
And it's always been clear that there's an awkward contradiction in PC culture, in that being able to engage in that ultra-careful analysis of language and manners, is itself a marker of class privilege. I'm horribly aware of it when I find myself doing it myself.
The annoying thing though is that Europe has clearly been slowly moving closer to the US pattern, with the decline in the traditional unionised working class movement, and indeed the changing nature of class itself (seems that an awful lot of educated younger people now suffer the same economic insecurity that education once insulated you from, so what class are they?).
But none of this necessarily is a reason for conservative gloating. Politics doesn't work like that. What things look like on the surface, or what people _say_ in response to polls, isn't necessarily a guide to what's really going on or what is going to happen. Probably especially so in the US where race and class interact in such complicated ways, and where both seem to be changing rapidly.