"Not constructive" is empirically a meaningless flag: it is used for everything from rude or dismissive language to comments with key details that should've been edits to the post to expressions of gratitude... Whatever meaning it was intended to have is neither well-communicated nor agreed upon; in practice it is used for anything you could possibly want to flag a comment for.

We will be dropping this flag entirely in the next 6-8 weeks; until then, I recommend that flaggers avoid using it, and moderators simply delete anything thus-flagged that should be deleted for any reason. Of course, that's my advice to moderators in any case.

"Not constructive" is empirically a meaningless flag: it is used for everything from rude or dismissive language to comments with key details that should've been edits to the post to expressions of gratitude... Whatever meaning it was intended to have is neither well-communicated nor agreed upon; in practice it is used for anything you could possibly want to flag a comment for.

We will be dropping this flag entirely in the next 6-8 weeks; until then, I recommend that flaggers avoid using it, and moderators simply delete anything thus-flagged that should be deleted for any reason. Of course, that's my advice to moderators in any case.