This exact thing happened to me too last night. I left my desk for a while to have dinner, and when I got back my Twitter feed had exploded into a frenzy of faux outrage that I was completely baffled about. Luckily for me, Ed Kilgore sums it up nicely. Click the link if you want to find out what happened.
Alternatively, resist the temptation and save your precious brain cells for something that actually matters.
UPDATE: More on the almost unbearable lightness of this “controversy” from Dave Weigel and Tim Murphy.