Since he didn't study abnormal psychology in college nor have a degree or expertise in diagnosing behavior disorders, I wouldn't consider his opinion to be expert. Probably just something he read online or heard in a movie. Maybe he though it was a cool thing to brag about himself, made him feel cool.
Virginia Tech student Natalie Keepers also referred to herself as a "sociopath in training" when she helped her "friend" David Eisenhauer murder and dispose of the body of 13 year old Nicole Lovell.
http://www.richmond.com/news/virgin...cle_6947b4d0-2dce-5de8-9395-fb907683e106.html
Eisenhauer and Keeper were also raised in cloistered or isolated conservative Christian families. Both attended private "Christian" schools growing up and only emerged into mainstream society later in high school. Both were in their freshman year at Virginia Tech and neither fit in with other students who had more conventional social and educational backgrounds.
Both decided they wanted to plan a "perfect murder" and chose a 13 yo girl that Eisenhauer had lured into an online relationship. Again, it was a case of "othering", thinking it was ok to have a sexual relationship, then kill a young girl because she wasn't like them.
There's something happening when these kids are growing up in these hyper-Christian education environments. Something they're learning, either overtly or indirectly, is convincing them they are superior to others. When the time comes to get out in the real world, some don't fit in. They're not prepared, haven't been helped with the transition. Their way of responding to social rejection from their real world peers is with violence.
It's a small subset of this group that's having problems with normal socialization, but JMO, we need to think about some research to find out how to prevent it. Do Amish or Mennonite young who leave the faith strike out and use violence against others? It would be interesting to know, but I don't know of any cases offhand. It may have to do with the individual interpretations of their religions - peace loving vs violent fire and brimstone. The Amish and Mennonites also have different views about the use of deadly weapons. It's definitely worth studying the young adults who've had isolated upbringings.