Good/constructive critique is critique that helps you strengthen your story by making it better as the story that YOU want to tell.

Any critique you receive that tells you that you should change the story in ways that take away from your idea in order to make the story more acceptable or more enjoyable to the person who is criticizing it, is not good criticism.

👍 Good critique helps the writer make the story more the story that the writer wants to tell.

👎Bad critique demands that the story be changed for the reader’s benefit.

Please note that this is specific to feedback aimed at telling the writer how to improve their writing, which is different from media analysis, review, etc which is aimed at understanding the fiction, not at changing it.