Do you mean in the story or in general?
That is one of the chief criticisms about Chris, especially with native Alaskans. I think Chris was an idealist and perhaps a naive idealist. His romantic notions of living a Thoreau-like life in the wilderness were at odds with the reality of the situation. Chris didn't realize what he was getting into and when he finally did, things had gotten out of hand. I think, however, that Krakauer was trying to say there was more to Chris McCandless than his ill-fated trip into the Alaskan wilderness.
Do you have a specific passage in the book to relate to your answer?
Some readers admired the boy [Chris] immensely for his courage and noble ideals; other fulminated that he was a reckless idiot, a wacko, a narcissist who perished out of arrogance and stupidity—and was undeserving of the considerable media attention he received.
What page is this passage on?
This is under author's notes. You ideally should be able to find your quotes and page numbers on your own.