White supremacy - the belief that you are fundamentally superior to others, is both individual and systemic. Some individuals believed this, then created laws and norms to support their position and strengthen their power. They then indoctrinated even more people to their way of thinking through fear-based tactics, in the past and still how, through physical violence and more recently through media propaganda.
A belief in superiority leads directly to racist, sexist, ableist, heteronormative, classist actions, which in turn hurt and even kill those who are considered to be less than.
We could sit around arguing the semantics of a word, or we can stand up, speak out, change laws, change minds, change hearts and make our world equitable.
Until every human being treats every other human being as equal - our work is not complete.