Was i wrong to argue with her?

[MaryMary]

I was a little apprehensive about hanging out with my sis and her male best friend, cuz then she is a different person around him. I went anyway. I was introduced to her friends. I was with the kids when she and her male friend went off without telling me. The kids saw them going off and went off with them. I was left behind. The new friends didn't talk to me, only a single male did. When my sis came back, I told her off. She apologised and I still went on. She got mad and said i saw her went off and they didn't plan to take kids with them but the kids went with them anyway. I couldn't be bothered to follow them. They were already far away so I stayed behind. I was very upset cuz it seems that whenever I get annoyed, she feels she is always right. I was very annoyed becos I didn't know her friends. I felt so small. I am 39 and she is 29. Everytime I go somewhere I would let her where I am going. It's called respect. I sure won't hang out with her again in future. Was I wrong to be cheesed off? Be honest. Thanks.