Anonymous wrote:OP here. My sister lives with me and my parents. Recently I and my friends received a museum voucher from the library we volunteer at and I can bring one other person. I said "______, I received a museum voucher from the library I volunteer at. Would you like to come". She doesn't answer and I say her name again. She doesn't answer so I open the door to her room and she screams "NEXT TIME KNOCK". I decided not to take her to the museum.
Why did you open her door without knocking? You have no grounds to do so. I'm finding it hard to believe you're 21. You sound like a teenager trying to control a sibling. I'm not excusing her spitting in your face (which, again, is what an angry teen would do) but you need to stop engaging and recognize the only person you control is yourself.