These are always my favorite: "Language is malleable." It is indeed. But that's a poor excuse, especially in situations like this, where the person in the post above is literally inventing her own definition of racism to fit her narrative.

Language does change over time. It adapts as needed to convey meaning more effectively in discourse between people.

Just not here.

The concept of believing one's own race is superior to others has not changed. We already have a word that describes that state of mind.

That word doesn't suddenly get to change its meaning the moment the established definition no longer supports the speaker's narrative. The meaning remains the same.