Unfriendly comments, although often understandable, are still a major blight on Stack Overflow, making the community look super rude and unfriendly. I don't know what the numbers are like (perhaps the "summer of love" helped somewhat) but I still frequently see comments that would turn me off visiting the place if I were an outsider.
Would creating a review queue specifically for flagged comments - or perhaps a subset of flags, like "not constructive" and "rude or offensive" - make sense?
There is some potential for abuse, of course, seeing as sometimes even 2 votes can annihilate a comment. Perhaps this queue should not count towards any badges.