Key to Relationships. If you don't need any relationship with anyone, then social skill is of no value. Of course, we can all do better with help from other human beings, thus, social skills can be extremely important. Good or bad social skill can be very obvious and is found out through talking and doing things with each other. People who are trying to decide whether to avoid you or help you will find out and decide.
Who? You are the only one who should be concerned about your social skills. Don't worry what other people think or how they judge or are critical of you.