Perhaps, though after reading the entire article, I'm not so sure the author is conservative. The website - Vox - is liberal. And the author doesn't have much of a public profile which would shed light on his ideology. Then again, his intentional hiding the ball is also part of the numerous problems with the article.
Some of his observations about liberals are correct so far as it goes, but the whole thing is de-contextualized, to where conservatives are the object in the sentence and nothing more. As if they have no agency of their own. The fact is, it is impossible to understand liberal "smugness" without understanding what is happening on the other side. So the author criticizes liberals for condescension, particularly towards poor white people. What he fails to mention is that many of these poor white people have been stuffing their heads with the likes of Rush Limbaugh, Glenn Beck and Ann Coulter going on decades now, and that this message they are stuffing into their heads is not just a conservative ideology - that is actually secondary to people like Limbaugh - but rather, a vicious and hateful de-humanization of liberals. And while Limbaugh does have some analogues on the left, the difference is that these analogues capture nowhere near the attention of liberals that the Limbaughs capture of conservatives.
I find it strange that one can write an article about smug and condescending attitudes of liberals and not even discuss the phenomena of conservative talk radio and conservative media, its popularity among conservatives, and how liberals are portrayed in said media. Any serious treatment of this subject requires a much more thorough, and bilateral treatment, than is offered by this author. If the author wants to argue that it is liberal smugness which created the phenomenon of hateful conservative punditry, much as he argues that liberal smugness has created the monster of Donald Trump, then he is free to do so. He'd be incorrect, but at least he'd be addressing the entire complexity of the issue, instead of presenting this bizarro world where liberals seem to be driving everything, and are the only ones actually doing or saying anything, while conservatives are just passively reacting.
This odd asymmetry which places liberals as the sole drivers of pretty much everything in our political culture is also what makes me wonder if the author is himself a liberal. If so, another thing he has failed to mention about liberals is that we tend to write articles criticizing each other more often than conservatives do. Case in point.