First of all, I'm 25, and I live with my mother. We're not American, and culturally, it's the appropriate/expected living arrangement. Just to clear up any potential misunderstanding that I'm some kind of lazy freeloader.

So basically, I'm on a diet. This morning, I asked my mother, who was running some errands, to pick up some additional bananas to make banana bread for everyone. She declined, so I said sure, I'll just make for myself. I proceed to put an enormous effort researching, adapting, and logging in every single pinch that went into that bread to make sure it adapts to my diet. 

Some friends of my mother come over, and she asks me 'Could I serve them banana bread?' I'm not too excited about this, and mention it, but ultimately say 'Sure, I can spare a couple pieces.' I try to get the pieces out and manage to take out two, since it's fresh out of the oven, they start falling apart. I tell her this, and give her the two pieces, and say 'This is the best I can do, they're falling apart'. I turn around to grab some water, and she's helping herself to another piece, wrecking the entire goddamn thing in the process.

So I tell her "Seriously, you couldn't have asked? I worked so hard for this and now it's ruined. Can't I ever enjoy something I made without you prioritizing someone else?"

Her response was not to say sorry, but to roll her eyes, raise her eyebrows, purse her lips, and sloooowly put the broken pieces of banana bread back to make a point. This made me so angry because fuck, can you just say sorry and move the fuck on?

So I tell her "You know, it's really hurtful and not productive to the conversation for you to make all these passive-aggressive faces. There's a conflict and you and I should talk and resolve this, instead of you mocking me for my feelings, which I think are VERY valid." 

Her answer? "Well, I can't control how you interpret things. It's not my fault." And she rushed out to give the banana bread to her guests.

I know I made a big deal out of this but to be honest, it's kind of the straw that broke the camel's back. She's constantly putting me last for everything after she makes sure all her guests and everyone she knows are happy, and I'm honestly sick of it. I know it's JUST a dessert, but it feels to me like she's constantly disrespecting my efforts. Am I an asshole for speaking out or should I just chill?