Lani Sarem’s “Handbook for Mortals” improbably topped the NYT Bestseller list last week. Then booksellers called foul, and the book was removed from the list. When Sarem saw the tweets circulating about her book, “my first thought was to just ignore it. It was just a couple of — you know, in my mind — silly tweets.” But as the day stretched on, and as she says neither Stamper nor West reached out to her personally, she reached a different conclusion: “I’m being cyberbullied, basically.”