Whiteness is not an abstraction; its claim to dominance is fortified through daily acts which may not seem racist at all precisely because they are considered “normal.” But just as certain kinds of violence and inequality get established as “normal” through the proceedings that exonerate police of the lethal use of force against unarmed black people, so whiteness, or rather its claim to privilege, can be disestablished over time. This is why there must be a collective reflection on, and opposition to, the way whiteness takes hold of our ideas about whose lives matter. The norm of whiteness that supports both violence and inequality insinuates itself into the normal and the obvious. Understood as the sometimes tacit and sometimes explicit power to define the boundaries of kinship, community and nation, whiteness inflects all those frameworks within which certain lives are made to matter less than others.
Judith Butler interviewed by George Yancy: http://opinionator.blogs.nytimes.com/2015/01/12/whats-wrong-with-all-lives-matter/?_r=2