When someone finds something good, let them be and do not take it from them. Don't be the police of which good things other people should be enthralled with.
If someone has a genuine, harmless excitement about something you think isn't so important, maybe you should think that person is more important than you do. Isn't it good enough just that your neighbor is happy?
Be happy with those who are happy. Be with those who are sad. Keep relationships with people different from you. You might never know the difference you make or when you won't see them again.