I have found that people tend to have a lot of ego, they are not really worried about you or me, they instead gravitate superficially to the loudest or people who are very good at banter, semi offensive banter, whatever it is.
a lot of social circles that develop tend to be harsh and difficult.
Of course it does happen when you meet a really nice group.
This can also depend on the age group and types of personalities you are spending time around.
Again its not easy. Its very hard. Sometimes people just don't fit in very well. But then sometimes they do.
The key is to realise that maybe the personalities are a mismatch and maybe the group is just not ideal or difficult for a lot of people to deal with. The key is to realise that and get on and not take it personally, that's the hard part.