Okay, so hey, we have a problem here. "Anti-social" isn't something that should be bandied casually about if we're aiming for accuracy here (especially if we're talking about how Peter was vs. his current portrayals). Those descriptions of Peter up there? Those are personality traits and normal emotions (and some as natural reactions from the plot) but those are not anti-social tendencies. A guarded personality is not a trait of being anti-social -- some of the most popular people in social circles have some of the most private of lives as well. It'd be like calling a grumpy person a hemophiliac colloquially when really the two traits are medically unrelated to each other.
It may sound like semantics but anti-social personality disorder is an actual, defined medical condition. It does not mean being a loner.
https://www.psychologytoday.com/us/c...ality-disorder
https://en.wikipedia.org/wiki/Antiso...ality_disorder