I've seen school age kids discuss these things as generalities quite enthusiastically when a teacher instigates the discussion.
I suspect this population was not randomly selected. Otherwise, someone might have explained to me why nerds are unpopular at a time in my life that it might have been actually helpful.
I think the author is needlessly overcomplicating things.
1) People instinctively form tight nit groups of friends with people they like. People they like usually means help them survive and raise offspring. This usually means socially adept, athletic, and attractive.
2) Having friends brings diminishing returns. The more friends a person have, the less they feel the need to make new friends. That's why the first day of school is vital.
3) Ill feelings develop between sally and bob. Sally talks to Susanne, and now they both bear ill feelings towards Bob. Th...
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