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The original was posted on /r/AmItheAsshole by /u/Baby-Eater25 on 2023-07-29 03:15:41.
I(29M) have a younger sister (14F) who I usually call “baby” or “babygirl”, this nickname is not said in a romantic sense, it was a nickname I’ve called her since around the day she was born, and me and my sister are very close and my sister herself has no problem with the nickname. My girlfriend(26F) has never really got on well with my little sister, Sister has said GF gets an attitude towards her and gets snappy or irritated with her for no reason. I’ve called my sister by my nickname for her a ton of times around GF and she’s never said anything about it before, neither has anyone else and our family finds it “cute”. A few days ago GF came to me and asked for me to stop calling Sister by “that weird name you call her”, I asked why and she said it made her uncomfortable, I didn’t see why it would make her uncomfortable but I didn’t want to her be upset so I said I’d try an stop around her, but that didn’t seem to satisfy her, she wants me to stop calling my sister “baby” and " babygirl" all together, I told her I wouldn’t do that as this is something I’ve been calling my sister since she was an infant, and she’s my baby sister and she’ll always stay that way. My GF is throwing a fit over a 14 year long nickname, my sister says she’s being dramatic, I want to agree with my sister since I don’t see how it’s inappropriate or uncomfortable for my GF to watch me call my sister those nicknames but I also don’t want to make my GF upset with me over something so small. My sister and GF have also had a few other issues but this is mainly about the nicknames. Sorry for the possible bad grammar as I wrote this on my phone. So AITA?