One takeaway from Frontline that I found very telling was the correspondence shortly after moving to Newtown where Nancy is writing about the boys upcoming birthdays. Nancy writes that Ryan is having both an old friends party and a new friends party and Adam is just having a new friends party. This throwaway line in the hour subtlety gave insight that once people interacted with Adam for a good period of time they rejected him whereas Ryan didn't encounter the same feedback.
Interesting point. I wonder if it also could have been that NL was trying to make a new start for AL (or for herself/family) not that some kids didn't like him. IDK. My first thought was that kind of party could have been really overwhelming for AL? In all, it seems to me that NL had about the opposite personality and needs than AL did... interesting dynamic maybe.