Am I being unreasonable in trying to steer the conversation into a topic that isnβt work-related?
Not at all. But when trying to look at it from their perspectives, their behaviour makes a bit of sense because for people who work full-time, 9 to 5, for 5 days a week, that makes up a lot of their time. But when people are passionate about their hobbies, like open source software or bird spotting, I would expect them to want to talk about that in their spare time.