Master and slave philosophy
Georg W. F. Hegel wrote about a certain kind of recognition that people need. According to Hegel, people have a need to be recognised as individuals by other individuals. People fill this need by being recognised by others who aren't put beneath them. Part of this happens when people struggle against each other, even to death. People will risk their lives just to struggle for this kind of recognition. However, the outcome of this struggle creates a problem for filling this need. The person who loses the struggle will either die or become beneath the other person. This is taking the part of "slave". When someone puts someone else beneath themself, they take the part of "master". The person who loses the struggle can no longer give or receive the recognition that is needed. Therefore, when someone is put beneath others it damages how they think of themself. But also, when someone puts themselves  others, they cannot get the recognition they need from those people anymore.