This has to be just about the most insulting and elitist thing I have read here on Slate.
First off, the very term "denier" is emotionally loaded, since the only time you commonly hear it used is in "holocaust denier." Since we all think those folks are kooks, anyone who is a "denier" must also be a kook.
The premise of the article seems to be that there is something wrong with our society for so many people to be acting like kooks, and "denying" something that has been PROVEN by science, and that everyone knows is true.
Skeptical about vaccine safety? You're a kook.
Skeptical that observed global warming is made made, and might not be more related to solar activity or a natural climate cycle? You're a kook.
Don't trust scientists when they tell you something is true? You're a kook.
But calling you a kook would sound weak, so we'll call you a denier instead as an easy way to discredit your position.
And by the way, who gets to decide when skepticism constitutes denialism? Oh that's right, Michael Spector gets to decide.