The current surge of enthusiasm around big data has produced a predictable backlash. Some of it, like Gary Marcus's New Yorker post "Steamrolled by Big Data," is insightful and well-reasoned. This is not surprising, since he's a neuroscientist as well as a writer, and so quite comfortable with data. Unfortunately, some other prominent commentators clearly aren't. Now, these guys are entitled to write about what whatever they like, but if they want to be taken seriously when discussing data they really should stop the kinds of elementary mistakes they've been making so far.