I think the point they're trying to make is that racism is a state of mind, and opening oneself up to being racist against a non-human or imaginary thing can open the floodgates to more "real" forms of racism against fellow humans. Basically the difference between anthropomorphizing bots while one expresses their dislike for interacting with them vs. expressing one's dislike of being forced to interact with a machine that is made to feel like interacting with a person but isn't. I'm not sure how I feel about this sentiment I've described, but it's one I'm open to arguments on since as a white dude I come into it with a mountain of privilege that likely blinds my view of things