I agree that it's inappropriate to criticize the author for ending her marriage -- that's obviously an incredibly personal decision -- but I still think it's silly to respond to criticism of a book with "Insulting someone's search for meaning is rude." Why is a book above criticism just because it's about someone's search for meaning? There are huge numbers of books written about exactly that theme, and a lot of them are terrible. If you don't want your "journey" to be criticized, then you guard your privacy as best you can. If you write a best-selling book about it, then congratulations, but dealing with people who think that your book is boring, silly, Orientalist, or whatever, is part of the bargain.