Fully agree with you.. i wrote something about it in my last post.
https://steemit.com/flagging/@miti/ladies-and-gentlemen-welcome-to-steemit-flag-show
I think that if you have a negative opinion on a post you have to write a bad comment, nothing else. I think it's a shame same as downvote.
It definitely seems like the more polite, adult way of handling disagreements of ideas: to have a discourse. Or even to simply ignore, if you don't want to communicate with the person to help both learn more.