Constructive criticism.
Really?
Criticism by it's very definition infers that I am doing something wrong.
 Personally I prefer the term constructive observational suggestions.
I don't know about you, but when I get "constructive criticism" I shut down. 
When I don't completely tune it out, I often respond by digging my heels in and sticking with my behavior or actions that are being critiqued.
Admittedly, I have become much more open to listening to suggestions than I may have been in the past. Still when it comes at me under the guise of "constructive criticism" I am less inclined to listen to, never mind act upon it.

I am confident in my abilities.
I consider myself of better than average intelligence.
I have a keen knack for problem solving. 
My observational skills are also better than most.
As I stated previously, I am much better today than in the past at taking guidance and suggestions. I follow directions well, especially when I have the ability to process information using my specific skills and methods.
I am not perfect.
Lord knows,I don't even come close.I am open to new ideas and ways to do things.
 I just can't abide it when it comes at me in the form of "constructive criticism".