That's just it: "and." Both of them. All anybody here ever talks about is the latter part, and when I try to also discuss the former, people just ignore it and respond in in-universe terms.
Critiquing creators' choices is not at all the same as attacking them as people. You can respect someone as a person yet still think they made a wrong decision about something. (And conversely you can recognize that someone is a terrible person yet still admire the work they did -- e.g. Alfred Hitchcock, Woody Allen, Bill Cosby, and far too many others.)
So it's not about the creator. It's just about acknowledging that the story in question is a created work, an artistic construct that can be evaluated on a "behind-the-scenes" level, rather than a documentary from an alternate universe that can only be talked about in terms of its internal facts and events.
I learned how to critique fiction long before I became a writer. It used to be taught in English class. And my interest in the behind-the-scenes side of the creative process began when I got The Making of Star Trek in around first or second grade, 6-7 years before I decided I wanted to be a writer. I guess you could say that early curiosity about the creative process presaged my interest in doing it myself, though.