Actually, Isaac, I think you tend to be Socratic. Sometimes you are thought-provoking. But one always feels one is on the defensive. At times it comes across as aggressive in what would otherwise be collegial discourse. I'm usually happy for the challenge, but prefer a more collegial approach.
Just as a social norm, critiquing photographs is a reciprocating activity. This is just how humans reckon it. We open ourselves to criticism by another in a close setting with the understanding that that person will reciprocate and do the same for us. Otherwise, as we compute it socially and morally, we are left vulnerable to harm where the other person is protected. It is a one-sided trust, and our brains reject that.