Plz help with this.Is this even right!?

Ok, My grandma is christaian and is always going to church every oppertunity possible ( i dont have a mom just a dad and a grandma) she loves god and all that stuff but she is way to rasist. i cant even wach the cosby show without her saying " you dont need to wach this, those poeple are diffrennt" when i was waching the super bowl i siad usher was hot and i got a lecture, she hates black and chineese, she says its wrong for a white cgristan to mary anyone black, is that true, i think its wrong.And what should i do.