Answer:
SPD - Schizoid Personality Disorder
Step-by-step explanation:
The first sentence is confusing, but look at the next two. He sits by himself, ignores social interaction from others, and doesn't go out of his way to do any extracurriculars.
It might look like AVPD, but people with Avoidant Personality Disorder are often very shy and afraid to be ridiculed and judged. Jake is laughing at his co-workers for expressing their discomfort, so it can't be AVPD.
BPD is often characterized by an intense fear of abandonment, so it would often be the opposite. People with NPD tend to want to be the center of attention.
Sincerely, someone with SPD & BPD in the family :)