I can't remember where I heard it originally, but it suffers from the "This racism is a metaphor for racism" problem that a lot of sci-fi tends to get close to. The issue ends up becoming that by making the discriminated party/group a literal different species, or a robot, or an alien, you dilute the core moral argument about treating all humans the same in the real world. What should be about racism becomes closer to an animal rights argument in-universe about how to treat things that aren't human, but aren't completely inert, which is a much more nuanced argument.

In short, metaphor is hard, especially when you're applying it to complex issues.

I had to stop like 10 minutes in a never got to the action. It was so heavy-handed in it's political commentary that it just came off as cringy.