Even if "Cis" was not a slur (arguably), 99% of the time people who use it to talk about someone other than themselves, use it in a derogatory manner.
No one uses it like "Oh, here's my friend, she's Cis!"
They use it like "You fucking Cis piece of shit"
It's true that Alejandro has a fake pussy that is actually a necrotizing wound that he has to treat and dilate so it doesn't seal up. Alejandro smears ketchup on the wound and shoves a toy baby inside before the gyno visit so he can feel like a "real woman". Is that original?