It's not an assumption, it's an assertion. Shunning is society rejecting something. If something is rejected it's because it's non functional.
Let's say you're working an assembly line. What kind of parts do you discard? The defective ones. The non-functional ones. Being a social reject means being socially dysfunctional. Function and society are closely related.
At this point.. I've explained myself. I am right. You will either get it or not, but I'm done playing this game. Goodbye