I heard a great advice while I was watching vids on how to improve my writing. "Reviews are for readers, not the authors". In fact, you're not supposed to read it. But we all know thats not happening. You get that notification about a review, and ur heartbeat goes up. Anticipation, anxiety, nervousness, all just floods u. It is like that for me. But if u want to continue writing, u'll have to learn a hard fact--u cant please everyone. I got a 1 star review from someone who didnt even read the first chapter completely. I mean, his title is "Couldnt even read first chapter". And theres nothing to be done to remove that. Cuz its his freedom to like or dislike my story. Unless he breaks the rules, his review will be valid. And thats fine. It feels bad as a author, but thats not a criticism. Thats his preference.
About constructive criticism, there's no such thing truly. People give advice, but its always based on what they think is right. They criticize based on their preferences. If u can take something from that and improve ur writing, its constructing criticism. Even if that review/comment is absolute garbage. And if u cant, then thats just criticism, negative, there's nothing constructive about it. Regardless of how well described or written that review/comment is.
I'll give you an example. One guy was going nuts in my comment section [RR], he was using curses, profanities, etc etc. Not only towards the char, but also me. I kinda snapped and had a back and forth with him, but that aside. What he was saying, I took something from it and improved. He was ranting about show not tell part. He made me see the mistakes I made in that part[even tho his language was anything but constructive, his criticism became constructive for me]. On the other hand, I've had several comments and reviews who tried to be 'constructive', but all they were were biased opinions. One guy went nuts over guns in fantasy part of my story. He wrote long and long essays on why its a disaster to do so. And turned out, he just read wrong, and was mistaken about how guns were used in my story. I took nothing from his essays, and it became just negative criticism for me, not even a valid one at that.
Anyway, all I would say, when u get such a review, read it, rant about it, then give it some time. It'll soon become obsolete to u.