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So I(17F) have a younger sister, Abby(15F) who is to put it simply, a brat. We were close when we were younger but ever since I hit puberty she’s been really mean to me. My mom never did anything about it and just told me she’s “figuring herself out” meanwhile my dad will try but gives up easily whenever Abby fought back, cut to 5 years later and now she’s just a bitch who thinks she can do whatever cause she gets no punishment. Anyway, we have a small square dinner table with 4 chairs. Abby sits on the side to my right, she refuses to sit across from me so my face “doesn’t make her food go back up”.

Anyway whenever she sits down to eat, she always moves her chair away from me and towards the opposite end. She does it VERY loudly to make sure everyone notices and to make sure I see her do it. However, I’ve never really cared about her behavior because I usually just stay in my room to avoid people. No matter how bad she thought her insults were or how hard she’d hit me it was just water off a ducks back.

But one night i was already having a really bad day: my grade was messed up, my lunch fell on the floor after I hadn’t eaten in two days, and i was really tired. So whenever she screeched her chair across the floor away from me I looked her dead in the eye and went “can you scoot further?”.

Her mouth physically opened as she looked at me with pure anger. My mom immediately looked at me shocked and said “____, stop. That’s rude”. I just looked at her like she was an idiot before getting up and taking my food to my room.

I seriously don’t get it. Abby acts like that for 5 years and nothing is done, but I bite back in one sentence and suddenly I’m the bad guy? I feel like I’m right but maybe I was wrong? Reddit, AITA