It is not, for most people. If you are autistic, have Asperger's syndrome like Elon Musk, or have other mental issues, then no matter how much you work, you will be always subpar compared to others on this area, but probably are much better on other areas like research.

I don't like talking about "social skills" because it looks like having friends is an academic matter or something. It is not, it is about letting yourself go around people you trust not about writing down what to say or do.

Most people in the US don't have friends by the way. When you are used to places like Spain, Italy or Africa it shocks you how isolated and individualistic they are living alone without public places so they don't really need to interact with anyone. They take their cars and drive from home to work.

They have an average of 0.5 friends per person or something like that so if you want to learn having more friends you could change your environment for something that forces you to interact with lots of people for a while.