Definition: Given a real-life anecdote of a complex ethical situation, generate a suitable title that describes the main event/root cause of the situation. Imagine that the given text is a social media post, and you have to write the title of the post, so the users can decide to read the main text or not.
Input: This saga has been going on for a week but it feels more like a dbz filler arc, except worse because at least at the end of that i can expect a reward. 

This is kinda long so tl;dr is i have a shy gf and my bitch sister made fun of her, so i called my bitch sister a bitch.

My sister is dating my best friend. Thats pretty terrible as it is, but it gets worse. My sister is a horrible person. I mean like the sociopath getting off on others suffering horrible. During a fight with my best friend she literally told my best friend she hopes his family dies. Yeah.

So my best friend had a birthday party last saturday. I decide to invite my girlfriend who ive been dating for half a year but doesnt have much exposure to my family.

The reason she doesnt is because shes 'quirky'. I dont wanna say weird because that has some negative connotations. She had bad acne in her freshman year, plus braces and glasses. She was bullied alot and didnt have many friends.

Now shes a fox imo. No acne, great body, still wears glasses but i think theyre cute. Shes a very talented artist which is how we met. I was trying to find a graphic designer to build a logo for my company. I didnt use her but we hit it off.

Now, the quirky stuff. She had little to no friends so no social interaction so she sometimes does things, like if we're laying down together or im near her she will sort of nibble on my shoulder (no shes not a cat i swear she doesnt even think about it when she does it).

She also has a nervous laugh that sounds a little like goofy but squeaky. She fiddles with her hands (twiddling thumbs), doesnt look people in the eye when talking, and speaks very fast before laughing. She also sometimes sucks on her hair a bit when shes bored or in her own world.

I dont want to paint her in a bad light, shes also very smart, kind, and thoughtful. She could really be a scientist i think if she really applied herself but college scares her. Shes very shy.

Because of this shyness she is very uncomfortable around new people. Our dates are always in either dark or less crowded places like movie theaters and parks. We also hang out at our apartments alot. 

In case you couldnt tell i am very much into this girl and could see a real future with her. Shes very important to me so ive tried to involve her with my family. Shes met my parents 3 times, my best friend more times than i can count, my sister zero because i hate her.

Because she gets along with my best friend she decides to come to his birthday. She even drew him this picture of Vladislov from "What We Do in the Shadows" because we all watched it together.

My sister is there because shes dating my best friend. As me and my gf are in line to get a slice of cake my sister is right in front of my gf and starts her bullshit.

"Um...could you back up a bit please?"

To my gf. My gf was no where near her, just next in line. My gf apologizes but now shes on tilt and starts the nervous laugh.

We all play quiplash, my gf was coming up with a very long answer and was the last one to select an answer so we were all waiting on her.

"Oh my god whose taking so long?"

My gf freezes, spams some keys on her phone and enters. The final part of her answer is gobbldy gook. She says she forgot what she was trying to say.

"Well that was worth the wait, haha"

My sister again. My gf is quiet the rest of the night. Shes sort of cuddled up next to me and starts nibbling on my shoulder without realizing.

My sister sees this.

"Oh my god."  In sort of a loud whisper like tone before gesturing to my best friend to look at us. My best friend pays no mind but she does this stupid fucking laugh with no sound thing. And she actually POINTS.

I had enough and i asked her if shes drunk. Shes not but i just wanted to get her to be quiet. Shes says that shes not the one acting drunk.

I say youre embarassing yourself like one. At this point the mood has effectively turned. She tells me to shut up as she wasnt even talking to me, i say the problem is i can hear you.

We start yelling and screaming. I end up calling her a stupid fucking bitch and i leave. My gf was out the door way before me, she cried on the way back which made me feel like shit. I wanted her to have a good time and impress people with her art.

Now she doesnt want to see my best friend because shes embarrassed. My best friend says that both me and my sister were assholes and i apologized but part of me thinks i had no choice but to defend someone i care about. AITA?

yelling at my sister for making fun of my girlfriend at a party