"Auntie is a black word"

Brittney • Graphic designer turned CNA trying for baby #1.
My nephews aren't allowed to call me auntie when they start speaking because their Daddy says that is a "black word". 
I told my sister (the twins' mother) their dad was a racist douchebag and asked her not to let him turn their kids into racist douchebags and she got mad at me. 
I'm pretty heartbroken, not only because they can't call me Auntie, but because they'll probably grow up to be like their father... 😞