Bad reviews comes from a few forms. One reason is it comes from a troll, two being someone who read it and just didn’t like it to three you read their book and you didn’t give them the review they wanted.
When my first book came out I did receive a bad review. Now I have read enough where it has been proven that having a bad review is a good thing. However this review came one day after the book was released and according to the site it had been a print book.
Last time I checked regular mail does not bring a book in one day. So I talked to Amazon and over the few following months they removed it, the person placed it again, Amazon removed it and so on. But finally it was taken care of.
But again having a bad review can be a good thing. How so? Well it is like a child being told they can’t do something and so they go about doing it around the parents back. When people seer a bad review or a low rating but yet all the other ratings are high it might make you take a chance on the book. I know that has worked for me anyway. Bottom line if nothing else it I a review which means it is getting noticed.
Look, I get it. A bad review is not fun to get but you know what every author deals with it even the authors who are well established. I have read a few books from best sellers to well know authors and they don’t always hit a home run.
And as a writer you must have a tough skin for not everyone is going to like what you write. It happens to the majority of writers if not all. The sooner you can accept it will happen the easier it will be. Spend your time and energy on your next novel.