Some people are humble about their work and abilities. They will never exhibit open pride. Or they don't want to bullshit people and blow smoke up someone's rear. Some may want to switch jobs because they are forced to do poor work and know they shouldn't feel proud about that.
This is probably a 'flaw' I have, but I'm aware of it that I know what I'm expected to sound like when asked this question. Now I'm put in a position where I am being dishonest. You're now testing my ability to BS you to get what I want, and by my nature I am already uncomfortable with BS'ing people.
Now compare this to the person who is too incompetent to not feel pride in the shoddy work they do.
Now the enjoyment part. I can talk about this extensively, but enjoyment is subjective. I could enjoy working on something because of the challenge of the problem, or because I was part of a great team, but it still doesn't speak to my ability to perform the job you have.