How about a "middlebrow dismissal" link to complement the flag link?
Of course, it doesn't need to be called "middlebrow dismissal" but there is nothing better for determining if something is or isn't middlebrow dismissal than users.
TBH, the flag link could be more powerful/useful by asking people to explain why they are flagging something. Later on you can release the categorized flagged post dataset for others to train an algorithm against. If someone is willing to spend the time to click on flag, they are demonstrating that they care about post/comment quality and that is itself a good indicator that they'd be willing to spend the time to tell you exactly why they are flagging something.
Of course, it doesn't need to be called "middlebrow dismissal" but there is nothing better for determining if something is or isn't middlebrow dismissal than users.
TBH, the flag link could be more powerful/useful by asking people to explain why they are flagging something. Later on you can release the categorized flagged post dataset for others to train an algorithm against. If someone is willing to spend the time to click on flag, they are demonstrating that they care about post/comment quality and that is itself a good indicator that they'd be willing to spend the time to tell you exactly why they are flagging something.