> Is this really the trichotomy of the Bay area?
From 10,000 ft, pretty much, although with any topic as complex as this, much nuance lost in the caricature. There are significant shades of gray between these three broad groups. I know households with blue collar workers married to doctors for example, and teachers married to property developers.
Where you really find the caricatures in this story are in households where all the workers are either highly compensated or very low compensated, or somewhere in between.
> Is this really the trichotomy of the Bay area? I thought it was interesting that none of these groups are turned out to be Trump supporters.
It's not terribly surprising though. The only population of the Bay Area who has a strong shared interest with the current POTUS is the wealthy established professional and capitalist class. Many of them still wouldn't openly support POTUS because of their disagreements on social and cultural issues - they are the "racism/homophobia is horrible but don't raise my taxes" crowd, which around here slots you a conservative Democrat.
And sure, there are xenophobes and ethno-nationalists in the Bay Area just like everywhere, but statistically there are fewer of them here than you'll find in other parts of the country more friendly to the current POTUS, so there's no point in calling them out as a major group around here.
Also lot of people in the elite group described in the article have close family "back home" that do fit the description of POTUS supporters, which is sort of a flaw of this article in that it only attributes such relationships to the blue collar class, when in fact they're quite ubiquitous. So much so that it has caused rifts between such people and their families. I am myself just such a person.