I just reread that comment and although I already responded to it, I only did so to the first part. As to the second, you said “But it's part of us, has meaning, and should be shared.”
No, it’s not “part of us,” it’s part of the artist, is personal, and so is its meaning. This isn’t group therapy where disclosure is encouraged but rather where each artist is allowed to decide what and if they want to say something about themselves to others through their art.
Perhaps you are familiar with the discipline of art therapy. While it has several modalities, some that work with psychoanalysis, others use “art as therapy” where the creation and process of making the art is used to work on a variety of issues such as self-esteem, cognitive and emotional issues, and just plain personal growth. The products that come out of this are not “…part of us, has meaning, and should be shared.”
IMO, many artists, and I would include myself in this, might not be working with a therapist but, to some degree, make their work with a nod, even indirectly, to “art as therapy” and find that it can boost self-esteem and lead to a range of personal growth opportunities. It’s not necessary to show the work to others for these positive outcomes to take place. The reflects the fact that we all create things for a wide variety of personal reasons.
As for this “pride” issue that has come up, let me comment on that. Some people couch pride as some kind of negative emotion, perhaps something that leads to boasting, etc. But, IMO, a healthy pride is the result of self-satisfaction that comes from a personal accomplishment as in a job well-done. There is no shortage of false pride around. I hear that all the time when people harp about being proud of where they were born. How is an accident of birth something to be proud of? What did they do to contribute to that outcome other than to show up?
However, creating something, such as a piece of art, is something that the artist can be proud of, having achieved a goal, and the artist may want to share that with their community of others who also create work and achieved their own personal goals. Whether they choose to do so is, as I’ve alluded, highly personal and certainly not required by society.