Clinical psychologist here. Dude would definitely meet the diagnosis for schizoid personality disorder, but I don't necessarily view people with that disorder as "pathological" per se, especially compared to the symptoms characteristic of other personality disorders. The problem isn't really that he thinks this way and chooses to live his life in this manner, as there is some truth to his arguments about the challenges inherent in being connected to other people. The problem is that his ideology is so rigid and inflexible that he has completely closed himself off from the possibility that things COULD potentially be different for him. And while he makes sound arguments for why this type of lifestyle makes sense for him, it seems like he tends to overextend those personally valuable insights into these broad generalizations about how the world/humanity/society works that are just not true for most other people with different types of life experiences. Not sure what his history with mental health treatment is, but he could benefit from therapy, not with someone who looks at him as "diseased" and is trying to fix him, but is willing to meet him where he's at and try to understand why he feels this way, and also appreciates that he likely has a very rich and complex inner life that sustains him. People like him are super interesting when you take time to get to know them.