People are more accepting of shyness and autistic behaviour from kids, but they expect you to be extroverted and NT by adulthood. If people can detect that you're a low-status sperg, they won't want to befriend you. This isolates the sperg, thereby creating a vicious negative feedback loop. That's what happened to me.
How do you explain me who used to easily make friends and have a funny personality to know being a shaking stuttering loser who can't talk to anyone AT ALL
Social skills regress if you're bullied into becoming a shut-in. Happened to me as well. The more I got ostracized, the more isolated I became, the worse my social skills became, and then I got even more ostracized. Now I'm a shutin.
I remember pre-kindergarten I would stand away from the other kids and quitely observe them while they were being completely chaotic. Now 26 years later nothing has changed, except those little NT boys are now being loud and chaotic in front of those same little NT girls, and getting sex out of it
Same same.
Social skills are almost always genetic, once a friendless loser, always a friendless loser.
Social skills are not genetic, but talent for developing social skills and sensitivity to social criticism are largely genetic.
If you have little talent for socializing, you have less friends and get more criticism, derision, bullying, ostracism rejection etc.
If you're highly sensitive to criticism, every sneer, rejection, prank etc. will make you desire to withdraw from the situation.
If you're withdrawn you don't acquire social skills. But you get older. The older you are, the more socially apt you're expected to be.
When I was 14 or 15 I made friends (mostly weebs too) just by sperging out at the school or at the mall. If try that today at age 37, I'd be banned from the place on the spot. Nobody (foid or man) wants to keep conversation with an unfamiliar 37yo balding male unless he's smooth-talking, rich, famous and/or good-looking.