Just because one person makes a negative comment about your work does not mean it is bad work. Someone else might love it. One person does not have that much power.
If 50 people say the same thing you might consider what they say. Still, if you believe deep down that some work you have done is good and everyone else says no, you might have to do it anyway.
I was studying a Matisse painting yesterday. It was one he did in 1904. Everything was flat. the table and walls were on the same plane. zero perspective. Yet it is a delightful wonderful painting that everyone treasures now. I can only imagine what it must have been like in 1904 when he did the painting. First he surrounded himself with fellow artists. That was smart. Artists are mostly encouraging. plus we are starved for something new all the time so they were probably adoring his boldness. But it could have gone another way, with everyone up in arms about his work.
So, there will be times when you will question yourself. It is a terrible job to be an artist and have to think about all these things. Much easier to learn to be a plumber and call it a day. A thing is right or wrong. It works or it doesn’t.
One of my paintings that I sort of questioned at first and not everyone loved was this one. Now I am glad I did not paint over it. Someone did buy it and they love it now , but for a year or so I was considering giving it the ax.