I'm reading a book called 'Why Buddhism Is True' and I'm not sure I understand author's point regarding social anxiety and natural selection:
Our ancestral environment didn’t feature cocktail parties, slumber parties, or PowerPoint. Our hunter-gatherer ancestors didn’t have to navigate roomfuls of people they’d never met or send their children off to sleep in homes they’d never seen, or give presentations to an audience consisting largely of people they didn’t know very well, if at all.
Just to be clear (and at the risk of repeating myself), I’m not saying that social anxiety isn’t in any sense a product of natural selection. The ancestral environment—the environment of our evolution — featured lots of social interaction, and this interaction had great consequence for our genes. If you had low social status and few friends, that cut your chances of spreading your genes, so impressing people mattered, even if PowerPoint wasn’t the thing you impressed them with. Similarly, if your offspring didn’t thrive socially, that boded ill for their reproductive prospects, and hence for your genes. So genes inclining us toward anxiety about our social prospectsand our progeny’s social prospects seem to have become part of the human gene pool.
So, from what I've understood, author claiming that the fact that we have social anxiety around people which we probably will never meet again is caused by the fact that in the past every social interaction mattered. Is it true from science perspective? I mean, the people who weren't social in the past would just die without passing their genes, how the social anxiety can become in the human gene pool in this case?
I always thought that social anxiety/confience it's just byproduct of all the events which happens with a child(if a child's social behaviour is positively reinforced then there would have less fear in regards to socialazing, public speaking, leadership etc).
PS: English is not my mother tongue, so I might formulate the question not clearly enough, so, it would be ideal if you can get additional context by clicking on the link and reading the chapter which the passage belongs to(6 pages). Just to be sure the answers aren't based on my interpretation of the author thoughts, but rather on the actual text of the book.