(Edit: of course I'm flagged for this. Surprise surprise)
(Edit: of course I'm flagged for this. Surprise surprise)
I would hope people aren't using flags for low-value comments, but you make a great point that it could have been edited to remove something that was deserving of a flag.
They could, and if you ask me, they should. They gum up threads and often start meta discussions about exactly how low-value they are. Many are even explicitly listed in the guidelines - snark, tropes and memes, 'broke the back button', shallow putdowns, etc. Righteously flaggable, one and all.
What (in your opinion) is the purpose of the down-vote button?
In a site with the ostensible goal of 'curious conversation', that's not really good enough - it's not the job of your potential interlocutors to figure out what sincere, reasoned beliefs and positions hide behind the throwaway trope line. If you want to have a conversation, it's on you to try to converse. There are lots of other places where the trope line is fine - from the group chat with friends or colleagues to twitter. But those places work in different ways.
What (in your opinion) is the purpose of the down-vote button?
It's a way to say 'this comment is misranked'. There are lots of reasons to feel a comment is misranked - including simple disagreement.