My point is the following. You are indicating to me that you are so far removed from "the rest of humanity" philosophically and via your experiences that a sense of (re)integration for you is basically impossible. You are also using emotionally-fueled superlative and generalizing phrases to overexaggerate the tendency of the world toward disorder. Given this and other bits, it's reasonable---I think likely, too---for a person in your situation to be such that they choose to try to comfort themselves with the fact that they don't want that (re)integration anyway in contrast to previous attempts at socialization, which are inherent to the human psyche and, for you, evident in you saying "I'm not saying I've avoided them all." That is definitionally sour grapes.
Just something to think about. Not saying that it applies to you. I just think it's likely. Also,
But you don't! Vacuously true antecedents do nothing beneficial for logical implication.
You're suggesting that the desire to fit in is a natural human impulse, and that when someone fails to do so, they may subconsciously adopt the belief that they don't want to fit in as a coping mechanism. That could very well be true. But it's also possible for someone to consciously decide that fitting in is meaningless or even foolish—regardless of whether they actually succeed at it. Even someone who easily fits in might come to that conclusion on philosophical grounds.
In this case, he claims he could fit in if he chose to, but refrains due to certain philosophical beliefs—beliefs whose origin we don't fully understand. So even if his stance is, in part, a form of self-protection, what practical effect does recognizing that have? If someone genuinely struggles to belong despite sincere effort, does this kind of psychological insight help them move forward—perhaps encouraging further attempts at connection and growth? Or does it deepen the sense of alienation and make things worse?