Yes it is true and it seems to be the result of our tribalistic history. We are well adapted for social groups of 50-200 people but have a hard time to "belong

Yes it is true and it seems to be the result of our tribalistic history. We are well adapted for social groups of 50-200 people but have a hard time to "belong" in too big groups. One could argue the subcultures/counter cultures of the young is a modern form of tribalism. This shows especially in larger social networks online, where people stop treating each other in friendly manner.