(I removed the flag) ![enter image description here][1]
DO NOT READ : WARNING RANT OVERLOAD
Every time I report an error, someone always replies "It's not important." "IT DOESN'T MATTER!!1!1!!!" Who freaking cares if it isn't important? It's stupid, and why wouldn't you want to fix something that's wrong? If you don't have time, do it when you do have time. I know this isn't going to happen for this reason. And i'm probably going to get hate comments. [1]: http://i.imgur.com/ap29SbZ.png?1
I think the reason you can flag those comments is because they are not technically hidden. But the answer is hidden so they don't show up.
P.S. You are right, even if it's not really important it's still something that should be fixed. I will check into it but honestly I probably won't get round to it any time soon, sorry.