I would just sigh, delete it and move on.
However, to play Devil's Advocate here, it is a "comment" field and not a "praise" field ;-)
I am not really sure that there is a lot of value in the comments anyway as many (most?) are simply generated by other members in a reciprocating manner as they are under the impression that the number of comments impacts the search ranking.
Just sayin' ;-)
- Richard Reeve
ReevePhotos.com