I've heard that agents and editors criticize harshly to authors and sometimes make them rewrite their work. One time, I submitted my older book to a small publishing house, and they said things about that offended me. I even told them that I didn't like that and my feelings got hurt, but then they accused my of "whining" and got mad. That was when I discovered that people in the publishing industry aren't really what you'd call "kid-friendly" or even "teen-friendly." On some other writing forums, people had said things to me that sounded insensitive. One of them said directly to me that may story was horrible. It left a bad impression on me and later, I came up with a topic of what they would do if their kid said something like that to another kid and that they'd get into big trouble for that.
This is not about my publishing future. I'm still not ready yet. But I am just curious why agents, publishers and editors can be insensitive and say things that wouldn't have been acceptable when they were kids. I've never seen a parent do nothing after their kid said an insensitive remark to another kid.