Don't get me wrong, you are in your full right to comment. Though it is expected that if you don't like a picture or edit, you comment constructive criticism, but you are not forced to do anything.
If a comment is offensive or overly pointless, it is up to the autor of the image to report as spam, block or maybe she doesn't even care and leaves the message be. But discussing over it is what makes a rather pointless chain. So we should stop calling each other stupid, pretentious and what not, and merely move on.
The autor of the edit is the one to take hands on the matter if she feels like it is something that should be adressed. Not us.