There is a gossip hanging on the wall opposite my house. What's wrong with it?

There should be no problem. Many people like to stick gossip or mirrors on windows or doors, facing outward, so that they can ward off evil spirits in their own homes, but I have never heard that it will bring anything bad to others. If you are afraid of something bad, you can also put a mirror in front of the window or on the door and look out ~ ~ hehe.