This comment is a fine example of jl's points. While the tone was not rude or aggressive, commenting merely to contradict and to attempt to invalidate specific points, out of context, is unhelpful to someone who is self aware enough to admit they are pretty, thin, and skinny. (We know our own and can read through the code.)
Jl is probably aware that this sensitivity can be overcome, and how to do so. Sometimes it's ok to pass over a thing in silence instead of telling a stranger to smile.