As someone who does the same, it's not a
forced line. In fact,
not talking about work feels far
less forced to me. Sure, there could be moments where something is so interesting you want to share it—but that requires talking to someone who won't just stare blankly at you because they lack the requisite knowledge and background to have the conversation.
More often than not, there's nothing so interesting happening with work that I want to talk about it. Before I was self-employed, I frequently hated how going to lunch with work mates meant having to spend time talking about work. It felt like lunch was just another meeting, instead of a break from work. I'd much rather have more meaningful and personal conversation—like, about books, art, traveling, relationships, whatever. Something that elevates us out of our role as workers and focused on our non-working selves. Conversation that helps increase our knowledge and understanding of each other. To be sure, that could mean work-related topics come up. But it gets seriously boring to talk with people who only want to talk shop.