Most people with good social skills don’t realize that those are learned — they just don’t understand that they acquired them early, through natural interactions with peers, and in fact they were not (mostly) born that way.
Those like me who had few natural interactions with peers, who were shunned and hated, but who later learned to have high-level social capabilities know 100% that those skills are learned. Because we did it the fucking hard way when we were much older and when rejection stings that much more intensely. And it was worth doing but damn it was difficult.
The privilege of the properly-socialized is that they don’t understand they have privilege at all; try being raised by wolves in a social hellscape and see how you like it. (Obligatory “You wouldn’t last an hour in the asylum where I was raised.”)