> [...] and yet I was part of a number of different social groupings in school.
While I share your objection on GP commenter's false dichotomy (though honesty who knows, maybe their high school was a real life enactment of Skins!) and their apparently judgemental attitude towards their peers, let's not forget that they also said they connected with:
>> The computer nerds, the anime nerds, the hobbyists, the actors, the musicians, the magicians, and the artists.
I.e. they were also part of a number of social circles despite not engaging in “non-stop sex, drugs and alcohol” etc.
I think that the overarching theme of this discussion is neither the false dichotomy that you pointed out, nor the dichotomy of social vs "non"-social, but rather how intense and alienating are a given culture's expectations to conform to the mainstream or its implications that this or that interest is better as of itself. Multiple social connections will always exist, and some shared interests will be more or less common. That is normal and socially healthy. What truly matters is that interest or lack of it in this or that hobby/theme/lifestyle does not result in cliquey social exclusion which can be very damaging in the long term.
Anecdotally, as someone who grew up in Spain, my generation would often comment on how bizarre it seemed to us that American high schools in fiction virtually always implied such a clear dividing line between those who were popular/sporty/cheerleaders on the one hand, and those who were nerdy/band/theatre on the other. Of course we knew people in school who would fit one stereotype more than others, and people were somewhat divided into groups of friends. However, these groups were neither themed, nor was belonging to one explicit and either-or, nor was there any implied social hierarchy in them.