This entire thread exemplifies what the author of that article is railing about, liberals on average come off like a bunch of pompous assholes when they go on the attack and they do nothing to be inclusive of the working class that has seen their jobs decimated by policies enacted by democrats as mentioned in the article....instead they ridicule them and suggest they are suffering from a brain defect.
I rather have to laugh at your mention of conservative talk radio...so you're suggesting its as mainstream as all of the outlets the author of that article had mentioned such as the daily show, the onion, or any host of various web sites, OP EDs in major news papers. I just don't see it, conservative talk radio while popular with those who are conservative doesn't get much exposure outside of that.
As others have mentioned Vox is a liberal site, chances are the author is liberal and realizes that continually giving people a hard time for their viewpoints isn't going to win anyone over, maybe that is why so much of the left has seemingly given up on working class white voters and is now focusing on minorities and pushing forward amnesty...they just don't want to bother.
If you want to see some of the stupidest assholes on the planet, watch working people's attitude toward unions. Those fuckers charge dues.