J.K. Rowling, the author of the bestselling “Harry Potter” series, is the target of massive social media attack. Her social media sin? A witty tweet noting that the word for “people who menstruate” is “women,” followed by a bold essay insisting “sex is real” and only females are women. She also tweeted: “If sex isn’t real, there’s no same-sex attraction. If sex isn’t real, the lived reality of women globally is erased. I know and love trans people, but erasing the concept of sex removes the ability of many to meaningfully discuss their lives. It isn’t hate to speak the truth.”