Greg Cox wrote:
Most writers, myself included, initially resist making changes. It's a knee-jerk reaction: "No! You're just not getting it. It's perfect the way it is."
It's a perfectly natural response, but then you have to get over it.
Whenever I send an editorial letter to an author, I always tell them not to respond right away. Take a few days to mull my suggestions over, sleep on them, and then get back to me.
I suppose this is easier if the person giving the critique also suggest a solution. For example, referring back to your passive protagonists, it's much more helpful when your critic says, "Why don't you have it so your protagonist sets the particular chain of events into motion?" rather than just, "Your protagonists are so passive."