& also add objectification of others, disregard of authority, narcissism, and slight delusions of grandeur (even after getting in trouble he still thought the teacher "wanted" him).

but yes you're right, one incident doesn't make a diagnosis, if i were this child's parent i'd start watching him closely though. becuase people with the antisocial personality disorder (commonly known as psychopathy) can lead normal lives, but they do need accommodation in the form of guidance and being taught coping skills