I have to disagree that suggesting ways to improve (via reading a book) are necessarily egregious signs of horrible misbehavior. Creating sarcastic backlog items, if done once, can be seen as a joke, even if a bit tone-deaf. There obviously might be more to this story than what's being portrayed, but if we are to take the blog post at face value, this isn't a fireable offense in my opinion. They could be reprimanded, but I don't understand the fierce blaming directed at the origin author.