I'm very good at not eavesdropping. Feel free to tell your friends secrets while I sit at the next table oblivious to what you're talking about. In fact, I'm also very good at not listening to people when they're talking right to me. If I haven't met them before, I'll find myself pondering the oddity that this person who's talking to me just told me their name not a moment ago, and I have no idea what it is. Then I'll realize I also have no idea what they've just said since I was thinking about how I don't know their name. The upside of this is that I'm also very good at keeping secrets since I never hear them in the first place.