We are artists and each of us produce something at least a little different from each other with our own personal flair and energy given to our work. Each type of piece appeals to a different kind of person. There is a huge diversity of taste in style. We are not competitors. We are fellow travelers, students and teachers. Being offended and annoyed by critique, unrequested or otherwise, is a waste of your mental space and emotional time. Take it. Learn from it. Perhaps all you will learn is that your work isn't appealing to the sort of person that made that comment. You can use that info to better identify and target YOUR market.
I don't envy other potters. I admire. I am in awe. I hope to reach their level some day. That does not mean that my work will look anything like their's though or that we would be competing for sales from the same types of customers.