Its an analogy that thoughts and words are only real to those who experience them. If someone thinks of something racist, does that make them a racist? If so, what proof do we have? You do not have to answer those questions.
Words are just vibrations sent through the air. Words themselves are no different than any other sound. What makes words good, bad, racist? Nothing more than our idea of what sound means. Does this mean all sounds can be good, bad, evil.. etc? Or is it just human sounds? All of this is subjective to the person experiencing the sounds.
So words are neither good, nor bad, nor racist... etc, as they are just vibrations our voice box creates. What is important is your interpretation of the word, which is totally subjective to your opinion.