I'm not sure what you mean by "frat-bro culture", but the overworking thing is generally pretty straightforward. If a company has any employees who talk about "

I'm not sure what you mean by "frat-bro culture", but the overworking thing is generally pretty straightforward. If a company has any employees who talk about "seven days a week onsite... putting in 10-12 hours almost daily", it's a high-pressure overworking kind of company that's not going to give you much vacation time. SpaceX doesn't exactly keep this aspect a secret, and as the author says he was an enthusiastic participant in it. Discrimination is harder to avoid because it's not tremendously correlated with overworking or other observable qualities of a work environment. IBM is the epitome of a work-life balance company - didn't stop their executives from secretly plotting to get rid of the "dinobabies".