Should I be enemies with my cousins enemies?

So my cousin had a fall out with a bunch of girls. They are all cousins. One of them speaks to me everytime they see me. I never necessarily had a fall out with them but I never had na issue either. They fought multiple times. But I feel like people look at me as a punk because I speak back or whatever when they speak. We are first cousisn by the way. Don’t get me wrong if we are in a setting together bad they are about to fight I’m going to help but if they are not posing a threat is it still a punk move to say hI and bye? I know they’re not going to try anything with me. But is it wrong?
Should I be enemies with my cousins enemies?
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