Would it be wrong to drop out of my sister's wedding when she isn't stopping racist comments that keep getting made

Me and my sister have different fathers. My dad is back so I'm mixed. I'm also the only person of color on her bridal party. The other bridesmaids have made multiple racist jokes and comments towards me and won't stop. One of her bridesmaids regularly uses the N word hard R and she defends it by saying it means ignorant which I hate when people use arguments like that to say slurs. You just want to say the slur. You don't care about the definition. This is you wanted to say a slur. That's it. My sister constantly says they are just joking and I need to not be so sensitive. Well the one that likes to use the hard R tells me a joke. She says a(hard R n word), and white person, and a Mexican are on a cliff. They all jump. Who hits the ground first? Not the (hard R). He's hanging by a rope. Is that supposed to be funny? Nobody says anything. My sister allows these comments. Allows comments on my race and stuff to be constantly made. I'm kind of over it and if I'm not gonna be respected in this bridal party then I don't want to be in it.