I'm not going to talk to my sister.
Is it because of arguments between you two?
Yes, we never got along.
Even if you don't get along with your sister not talking to her at all is rude. Talk to her but avoid getting into arguments.
Have you met my sister? She is so difficult to get along with. I'm sure it might work for other siblings but for us it is not the same. I have tried it before many times.
Rudeness comes in all shapes and forms. Being this way with a sibling seems to be rough on you, I understand. But the ability to get along with everyone regardless of their emotional state is a gift you should practice with more.