I have on two occasions met my sister's friends when apparently they said I was unfriendly or something to her. She then chastised me. I told her it is not appropriate to chastise me when I did not know these people at all.
Occasion one: Sister forgot her keys and drove an hour away with her boyfriend. I went home in the middle of errands pre-wedding to be there to give keys to friend and do sister a favor. Friend comes to door with a phone to her head, half smiles, but not really at which point I hand her the keys. She promptly leaves. Weird, but unremarkable.
Occasion two: I'm with sister at Walmart. She sees her friend who I have never met before. She does not introduce us. I do not say anything but hi when she is nearly done speaking with him and tells me his name.
Side note: Sister is a former cheerleader, super bubbly, bouncy, etc. I am not.
Who is wrong? Should I have been super duper friendly in awkward situations or is she overreacting because her friends expect me to be more like her?