Basic Trope: Characters who spend the majority of their time alone are considered to be social deviants.
Straight: Lorenzo spends the vast majority of his time alone, and he's considered to be an outcast and freak.
Exaggerated: Lorenzo spends the vast majority of his time alone, and he's considered to be a villain who schemes against others.
Although Lorenzo has only a few friends, he is still considered a bit weird whenever he's alone.
Although others don't mind Lorenzo's solitary nature, they are a bit concerned about him.
Humans are social animals, and the others are naturally inclined to assume that Lorenzo is mentally unbalanced.
Lorenzo is a recluse who lives off the grid in a cabin in the woods outside of town, hunts and grows his own food, has no job, and wears animal skins he made himself. He's actually a friendly guy, but nobody wants to talk to him due to his bizarre lifestyle.
The preconceptions that Lorenzo is a freak really start to take a mental toll on him. Things eventually turn into one vicious cycle, as he starts to intentionally avoid others even more, therefore making the others spread the "freak" rumors even more. That's when he pulls a Face-Heel Turn and they still ignored him, so he pulled off a Slasher Smile and decided to kill 'em.
Their "humans are social" belief is so strong that they don't believe anyone could possibly enjoy being alone, and dismiss his claims that he really does enjoy being alone as a transparent case of sour grapes. Jerkasses mock Lorenzo for being a "loser" who "failed at life", while the nicer people out there take pity on him and try to "help" him be more "normal" and sociable so that he can finally have a happy life (much to his annoyance).
The "humans are social" propaganda got into Lorenzo's head making him more depressed to the point of contemplating on killing himself just to escape from the scorn and antagonism of those sociable arseholes.
The "humans are social" propaganda got into Lorenzo's head making him feel that there really is something wrong with him, and as a result, he makes an effort to be "normal". However, he is miserable that way because he hates doing "normal" activities, and he is miserable when alone and doing things he actually likes because he feels like a loser and a freak.