The idea that tech employees are docile compared to the accounts receivable group at a major US insurance company seems pretty hard to support with evidence.
So maybe step 0 is: find people who know about them, before you can do the talking and reading. The New Yorker is my general go-to for measured introductions to new domains: the authors biases are fairly simple to spot when relevant (leftish-intellectual-in-US-terms) and the level of detail is usually high.
Sadly, I don't have a ton more at hand, other than one rule that I'd highly recommend to use as a filter: if you get the feeling the person is trying to make you angry, find something else. Polemics are rarely the best way to be introduced to a topic.
but, worked with, not at, but generally about equal in raw numbers - it really depends where the docility comes out - in fortune 500's being weird in general is strongly discouraged, but the penalties for stepping out of line are small usually, the big benefit is, cultural norms are clearly established, and generally followed - in a SV company, being weird is strongly encouraged, cultural values are somewhat more nebulous, and the penalties for stepping out of line are often much more harsh.
Reading posts here often feels like I'm in bizzaro world where I've never actually worked in "tech". Yes, my current job is more laid back when I'm not on site at a multinational client's office, but it's not that much. It's still a desk job in software. The scale I use to judge workplaces extends into back into my time in restaurants, retail, admin, music, and mechanics' shops. Now, if you want to talk culture, I could tell some stories about those places (and pardon that expression, I could obviously never tell those stories here).
To explain further - in F500 Culture, only a narrow band of self expression is possible - but what is and isnt is clearly defined - in SV Culture, a much wider band is acceptable - but the unacceptable is much less clearly defined.