Everyone has a preconceived notion of what equality entails. It is the state of being on an equal footing regarding status, rights, and opportunities. It’s all about justice, fairness, and non-discrimination. It’s something we see as lovely and desired inherently.
We don’t have to go back very far in history to find examples of this not being the case. Sexism, racism, and other forms of discrimination were commonplace less than half a century ago.