And this is the rub. It seems there are two or three common definitions of "entitlement", but the one used in the article was most certainly the one your ex was using.
For example, I disagree with House of Cards' Kevin Spacey, as the United States Constitution and Bill of Rights entitles its citizens to quite a lot. I'll agree with Joss that investment in fiction doesn't entitle fans to demand certain behaviors of the authors, but I'll also agree with Gaiman (and you) that the expectations of your audience is incredibly important.
Really, had I not been writing on a tablet at the time, I might have gone on to say that the originally linked article was pretty horrible because it was comparing two things which are not exclusive, using loaded link-bait phrasing. "Chocolate: It's poison! And delicious!" Er, yes, these two things are true. And? And?!