What if someone wants to use the traditional definition of racism, as prejudice based in race? That's still the dictionary definition. Do you just ... I don't know ... hate them for their definition?
I mean, they could turn around and just as you tell them to "Stop acting like ... etc. etc.", tell you to "Stop redefining dictionary words because your confusing rather than assisting the dialectic."
Maybe you need a new word. Maybe "Ultracist."