If you accidentally overhear some stuff that doesn't concern you, don't spread it around. It might be fun news for others, but you might be hurting someone. Act oblivious to some incidents or as if nothing was overheard and get back to your work.

 When a person is humble enough to accept that other people are eligible to have their own viewpoint, that person is minding his own business. In the modern world, every human is born free and is free to choose how he wants to live his life and that should be nobody else's business unless that person is morally or socially wrong. After all, the world's a democracy and that way, everyone is allowed to slap a person who has forgotten to mind your own business