Why some people lack social skills?
Basically, it takes practice. The more types of social situations you're involved in, the better and more dynamic your social skills become. You can't expect these skills to just be there without actually using them and refining them. Now you can say that some people are more social than others, but that only determines how much the individual is actually willing to practice. People that are social practice more... basically. So if you're not really a social person, you would have to give it a little extra push in order to build those skills up. In time it helps, I mean hey, worked for me :) I wasn't always a social person, I knew I had it in me, but found myself holding back in a lot of situations. One day I just decided that I had nothing to lose and just went for it. That's pretty much the attitude that you need to have.
it probably depends on how theyre raised if your sheltered then you probably arent used to rough minded individuals and can misunderstand theyre attitude if you mean by why some people cant hold a room its all charisma youd need to reflect on yourself if you want to get noticed
I tried to sum it all up but its hard to explain in text