Reading the comments is rarely a good idea. But when opening a breaking news tweet on March 16 about a rash of horrific murders across Atlanta, including six Asian woman working in three separate spas, the overwhelming sameness of the replies was unavoidable, infuriating, and instructive. “Not quite the happy ending they were expecting,” crowed one. “No happy ending then?” asked another. “Definitely not a happy ending,” declared another, throwing in a gif of a stick figure drumming a “heyo!” rimshot to make sure anyone reading it would understand that they wanted a laugh. Endless tweets of the same snark,...