I hate anyone that hates cats, especially black cats because their pretty 😊
To be blunt, people hate black cats (or cats generally) because most people are not that bright. The Catholic church once killed cats and cat owners because of fear of the devil. There's still people around to this very day that thinks yoga is satanic. The cat generally has been the most discriminated animal that unfortunately has fallen prey to not the brightest people on the planet.
I would say out of all the deaths to fear, death by stupid person is particularly dangerous *shudders.*
Sorry you have to put up with that but at least she's a good cat and you love her. That's all that matters.