I'm not touching this one.
On another forum of which I'm a member, the posters' bios, visible to the left of the post, have a choice of "I welcome positive criticism", or "I want encouragement". Something to that nature anyway--I forget the actual wording.
The bad news is that very seldom anyone actually makes a critical comment.
I don't know the answer, except that I personally want to hear criticism. That's the way you learn.