It's just something that I personally never want to read about in detail. I can handle "he was sick", but any more detail than that and I'll really wish I hadn't read and possibly not be able to eat for the rest of the day. But it's a quirk that's specific enough to me that I wouldn't go off in a rage at the writer for not warning. I appreciate the warning very much, but I don't think someone's a jerk for not including it.