In this case, the two definitions and their purposes would be:
Definition 1. "One not actively working to create equal outcomes for non-white groups (even simply being neutral/disinterested is racist in this definition)". This is the definition of racist in the popular How to Be an Antiracist. This would be used to attach the word to the target.
Definition 2. "One directly and intentionally harming people of non-white races out of conscious and deliberate hatred". Basically the KKK definition. This is the implication that's attached to the target, after definition 1 is used to "stick" the word onto the target.
It's an amazing "stick and stab" tactic that, somehow, we haven't yet developed cultural antibodies against.