When I read it, your comment was invisible to most users and at the bottom of the page. Flagging is done by other users who are offended at what you say (presumably by the 'experts' who dismiss an experimental prototype aircraft because the new tech doesn't make sense for quadcopters..)

You can vouch though after clicking on the "... minutes ago" field, which is what I did in this specific case and apparently enough others to undo the flag.