To me it's very obvious:
This is a public forum, and there's no way (apart from severe censorship, which we won't do) to sort out all the comments so that only the "nice" ones remain.
If you post pictures of your work on a public forum, you need to accept the fact that the public will respond (as is their tight). You'll get positive comments, negative comments, and sometimes rude comments... but if you post, you're open to comments.
If you can't handle the comments, don't post your work. Simple as that.