Yeah, that's true. Like I was saying in the Ryan thread earlier...I think Ryan had it harder than Trey overall before moving in with the Cohens because 1) I think the Atwood family fell apart when Ryan was maybe 5 or 6 but it seemed that when Ryan was a baby, the family got along okay so Trey endured more "good" times than Ryan and 2) Like you said, Trey doesn't take crap from anyone and I think he hated Dawn and moved out of the house when he turned 18 or maybe even a bit before, which left Ryan alone with Dawn and her abusive boyfriends.
For example, Dawn mentions that AJ beat her and Ryan but never mentions him hitting Trey.
Obviously Trey had the harder life after Ryan moved in with the Cohens.