Culture fit certainly isn't just good/bad attitude. It's whether the way people do their jobs is compatible with the other people. Some companies release early

Culture fit certainly isn't just good/bad attitude. It's whether the way people do their jobs is compatible with the other people. Some companies release early and often, while some test thoroughly before releasing. Some have long meetings, some have short standups. Some start work early, some work late into the evening. Any of those styles can work as long as people agree. Considering culture fit means trying to hire people that share the same style so they can work together effectively. Culture fit is also a way of excluding jerks. You encounter some abrasive, abusive, or misogynistic personalities in tech. People usually don't want to say "this candidate is a jerk", so they use "bad culture fit" as a euphemism. Once the answer is no-hire, the details don't matter anyway. Building a team that works well together is extremely difficult. Unless you've actually hired dozens of people and seen them either work well as a team or kill productivity with interpersonal conflicts, better not to sit in judgement of people who have.