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: **TL;DR at bottom**

First off, just a little background. My (18F) boyfriend (19M) have been together for going on two years now. We're both in college and we both live with our own parents. However, I hit some rough times with my family and I lived with his family (and paid rent to them) from April 2018-November 2018 until I patched things with my parents and moved back home. My BF's parents have always been really, really controlling. Anytime he wants to do something that they don't like, they threaten to not pay for his college (that they pay a whopping $1k a year for, thanks to the many scholarships my BF earned). Keep this in mind, its relevant a little later.

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Now fast forward to today. My BF and I took my younger brother to a "fancy" grocery store near us to get some muffins that my brother really likes for brunch. We bought a 4 pack and my brother ate his, but my BF and I brought the other 3 back to his house. We accidentally left them on the kitchen counter for a few hours, so I asked my BF to go grab them. He saw that someone had eaten one, so he just asked who had eaten it and apparently his younger (14F) sister had. NBD, right? We had an extra one anyway. So he came back upstairs with the two remaining muffins, handed them to me, told me what had happened, then walked to the bathroom. A minute or two later, his mother comes storming upstairs, screaming. She barges in and starts screaming at me. This is how the conversation went: 

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Mother: *sister* is in her room crying because you were mean to her

Me: Why are you screaming at me? What's going on?

Mother: Here's your fucking two dollars for the fucking muffin, bitch. \*THROWS money at me\*

Me: What's going on??? Why are you yelling at me?? \*Throws money back at her\*

Mother: Ungrateful bitch.

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At this point, BF comes back into the bedroom and tries to diffuse the situation. His mother continues to scream at him. From this point, it continued to escalate, but not really involving me. His dad comes up, screams at him about being disrespectful (neither of us had been disrespectful, and we're both confused as to why this is even happening), and threatens to stop paying for his car insurance and college. Not even threatened really, just said that he wouldn't pay either of those anymore. My BF and I left and went elsewhere, but now I've told him that I will not go back to his house at all until his mother apologizes to me. He's pissed off at me because he says that I'm making this worse for him because I'm putting him in the middle. So, reddit, AITA?

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TL;DR: BF's little sister ate something of ours, asked about it, mom flipped screamed at me even though I had nothing to do with it and now I want her to apologize. BF is mad at me and thinks that I should just get over it.

demanding an apology from my boyfriend's mother