My fictional Fairy Kingdom despises humanity for its warlike and polluting qualities and has a complete blind spot on its own history of violence, greed and corruption. But for me that makes it a real world. Aren't we all blind to our own failings at times or seek to excuse them or try to cheer ourselves up admitting our failures but insisting X, Y and Z are far worse?
So what is the attitude of your fictional world to other worlds? Does it accept they are out there? Are they keen to develop ties or do they want to be left alone? How advanced are they in science, enabling them to go and find other worlds for themselves, say?