I am sure you have seen, or at least heard of, TV programmes where they take a frog and in half an hour turn him into a prince. At the end you get to see pictures of the frog and the prince side-by-side. The "before" picture and the "after" picture.
I leave you to draw your own conclusions about someone who is a model for the before picture.
I agree with tepatria. Even with a joking demeanor, there might be a small lack of self-esteem. People will sometimes comment on something about themselves before someone else has a chance to form it in their mind.