Social anxiety and worrying about the "wrong" things
I got to preface this that this is not my problem, but I'm helping some people right now with "overcoming" their social anxieties.
So what I noticed is that oftentimes they are really anxious about how their behavior makes them unpopular in a group of people, but the aspects of their behavior that they worry mostly about are so irrelevant and neutral while socializing. Meanwhile they confidently make huge mistakes in social settings that make them really unpopular.
So for example they worry that people will start to hate them for not having watched (and not knowing about) the latest Netflix series. Or they worry about not knowing the answer to a question in class. They will fear being an outcast if something like this happened. But then again they will happily say hurtful things to their friends or be a general nuisance towards the group, which will eventually make them end up unpopular and alone.
I really wonder about how this cognitive dissonance comes to be. Worrying and ruminating so much about completely irrelevant social aspects, but then again alienating themselves by absolutely inadequate behavior. Has anyone of you observed something similar? What is the reason for this? And what can I do to help them better?