Criticism for writers can be quite daunting. And yes, some criticism you should listen to if it is constructive and meant to help you better your writing. But if people are saying negative things about your story without any constructive criticism, I would tell you to not listen to what they say. Some writers take what other people say to heart and end up not continuing their writing because they feel that it isn't good enough or it isn't worthy continuing. One of my favorite quotes is as follows:
"It is impossible to discourage the real writers - they don't give a damn what you say, they're going to write." ~Sinclair Lewis
Don't listen to what people say about your writing, never lose the passion that you had for your writing in the first place, and always keep at it. The only important thing is that you are happy with your writing and if you are, nothing else matters.
Just always keep writing and don't listen to the insults of other people! People have gotten a lot pettier in our lifetime and it is our responsibility to not let them get us down. Keep writing and keep your head up! I ha