That's because you are not understanding what's been posited.
When you are white, and you are living within a society that supports and advances white people over all others in nearly every way, and nearly all the time, and you accept that advantage by participating in that racist system, and by accepting the gains you receive from it, you ARE A RACIST by your acceptance whether you like it or not, whether you realize it or not, and whether you deny it or not. You are a racist by you participation in a racist system, and by your acceptance of (and even more-so by your denial) of the advantages you continue to receive simply because you are white. Racism does not require that you be aware of it, or that you consciously approve of it. Racism isn't just a state of mind, it's also a course of action.