You are just using your guy's mind to see your sister.
Your sister is just using her girl's mind to see you.
Guy's and Girl's mind think very differently.
It depends on what trigger her to tell you off. It might be your
behaviour. It might me that she's just growing up. It might be the
example in your family. Nothing last forever. Soon, you will
miss her when she gives up on you and stop caring for you to even
bother to tell you anything. ironic but true.
This is just the way it is. Until you step out and see another
person's mind. The only way to see it is to communicate. Not hear
all that blabber but to hear the message under it. More often than
not, its concern for you.
You can also tell her not to scold you and you do not want to
fight. If all you do is to escalate the situation.You are equally
wrong. Both of you learn nothing from it.