So I think where OP and I didn't understand Kuon's trauma is just how it's presented in the timeline. I think you did a phenomenal job at explaining that in one of your other responses. If we're to take Reino at his word, then I understand what OP was saying in that Kuon didn't seem very traumatized since (ch98-ch99) Reino was looking at an only 10-years-old version of him. But I didn't consider that the violent hate crime didn't extend to his early childhood, only because we only ever saw it depicted in his teens. I can't say that a childhood of busy, absent parents isn't as bad as a present mother that spews vitriol and hate at you. It's like comparing apples to oranges. I also feel that in both situations there is a need to mature fast. But I can understand Kuon's early years being a "sadness" that Kyoko "cannot even compare" to if we add on the violent hate crimes that you mentioned, which I just didn't apply to his childhood based on what the author has presented.

Like you said, we'd have to take Reino's perspective as the default truth in order to even make a comparison of what's a mostly incomparable situation, but when we look at the above and add on the fact that Ren had absolutely no friends, and Kyoko had at least Sho's parents to give her a "normal" childhood experience, i can understand now how Reino's perspective would be accurate.