I think how a photographer reacts to comments, positive or negative, depends on that photographer's sense of self-worth.
Basically, it is YOUR photograph.
But people will have different opinions on your photographs. And some are more forthright than others. Some VERY forthright! to the extent of being obnoxius!
BUT, it still represents his feelings and reactions to YOUR photograph. In fact the more spontaneous the reaction, the better and more honest his opinion may be. Whether his opinion is born out of long experience of seeing photographs or not is to my mind, irrelevant. I will take his opinion seriously, and ask him why he did not like my photographs. If he could explain, good. If not, it will still stimulate me to ask why.
In my opinion, the worst kinds of comments are those that says "wow! pro! works of a guru! :thumbsup: , interesting!"
The reason why I believe these are the worst comments is that it does not teach me anything, because I KNOW the standard of my photography. And such praises are often from people who do not know better.
But at the end of it, these phorographs are mine. And comments/critique, positive or negative, are feedbacks for me to evaluate my works. I might change. I might not. But I will have the benefit of others feelings/reactions and opinions of my images.