* People are two-faced. There is a distinct lack of sincerity in any human interaction compared to interacting with literally anything else. I know a machine is being honest with me, I know a dog or a cat is being honest with me, and I know a human is being dishonest with me.
* The needs and desires of one will not align with those of another. Groups of people must compromise, and compromises leave noone happy. This modern age of people being manipulated into division and strife by the bigger powers-that-be make this even worse.
* The desires of some to wield power leads to awkward and harmful social dynamics. Best to not get involved at all. For individualists, this is perhaps one of the biggest sticking points to socializing. Outside of professional obligations, nobody likes being told what to do.
* People need sufficient time alone to remain mentally healthy, even those who are mega extroverts. The problem is, most people do not understand this and become nuisances in life. Worse is when certain social arrangements (eg: a family) make distancing oneself practically impossible.
I think these are all good points, but they don't really apply to people categorically; but rather to some people in some situations.
For example, if half of the group wants pizza, and the other half wants BBQ, a compromise might make everyone happier if they value eating together over eating their preferred meal apart.
