Social intelligence and how some learn it later than others,

To me, this is a very important post. It's about social Intelligence - Having struggled so hard to learn it, I have so much to say on this topic.

There are many sub-communications that are being telegraphed at all times in any interaction. Both
verbal and non-verbal.Social interactions have features and customs that I suppose are designed to make them pleasant.As social animals, we have the attribute of actually enjoying socializing just for the sake of
socializing.
We socially VIBE.
People who break the vibe are considered socially unintelligent, and despite being perhaps very
good/worthwhile people, they will come across poorly.

Most people, once you get to know them, are really worthwhile. I've rarely met someone, who when
put in a position where I was by circumstance made to get to know them, that I didn't come to like.
So what's the difference between someone who is COOL and someone who is UNCOOL?