A person is usually very demanding and demanding of those close to him, while he is very polite and has no requirements for outsiders. If this is reversed, the world will be at peace. This is a famous saying of a writer. As for the reason, it's because you can do whatever you want in front of your family. You feel confident and people will forgive you and indulge you. And you clearly know that outsiders will not be so magnanimous and let you do whatever you like. In front of your family, you are your true self, and you don’t have to think too much about your love. In front of outsiders, you are your superego, who pays attention to your image and pretends to be more social and mature.