People Get Uptight In These 'Am I The Jerk?' Stories

"I am 19, and I moved in with my dad and stepmom almost a year ago. For about the past year and a half, my stepmom has been keeping her niece on the weekends to visit her. Sometimes, her dad brings her food to have on the weekend, but other times, my stepmom buys it. She has told my dad and me that she didn’t want us to eat the snacks she had in the kitchen. My dad hasn’t listened to her about it, but I have, until today. I was making breakfast while looking in the fridge for something to add to my meal, and I saw her niece's yogurt in the fridge. I know she didn’t want us to eat them, but there were a couple left, and there was time before she came over again, so I took one and planned on replacing it before she came back over; I didn’t think it would be a big deal. So, she comes home on her lunch break, comes to ask me something, but then looks at my desk, sees the yogurt wrapper, and asks if I had eaten one of her yogurts. To which I replied, "Yes," and told her I would buy her a new one. She just got upset, left my room, and slammed the door. This is where my problem comes in. When I get paid, I buy some of my own groceries and snacks for the week. And when her niece comes over, she always asks if she can have some of my stuff, which I don’t mind because she’s just a kid. Sometimes, when my stepmom doesn’t have much money, I even buy her niece toys, dinner, or snacks. I do this pretty often, so most of the time, my stepmom just assumes I will say yes when she asks me to buy her stuff. So, in my mind, I think that since I share my stuff with her and buy her things, she wouldn’t mind if I took a yogurt and then replaced it. I was wrong. So, she stormed out and was mumbling under her breath, and of course, I got irritated. I didn’t think it was that serious, especially since I was going to replace it. So, I posted about it on social media for her to see, but I didn’t mention her name. She then saw it and texted me that I can be mad, but I don’t have to buy her or her niece anything anymore. So, I replied “cool,” and she got upset. So, now we aren’t talking to each other, and I just don’t see how it is that serious. Am I The Jerk?" Another User Comments: "Tell her you were doing a kindness, not an obligation. She's a parent and shouldn't be acting like a 7 year old herself. NTJ. It's serious to her because she's losing something and wants to be selfish. Honestly, personally, I'd never buy anything for them again like she said. She's confirmed through text she is willing to be spiteful at her family's inconvenience, so I wouldn't do it anymore. There is no appreciation but plenty of entitlement and expectations. The child is coming over as your parent's responsibility, not yours. I hope you don't let this bother you; let it go." A91kidd Another User Comments: "So far this is going to be an unpopular opinion, but ESH. I think your step-mom sounds like an entitled and selfish brat. I 100% agree that it shouldn’t have been a big issue. However, I do think posting about it on social media for her to see was an immature move. I would have suggested talking to her (or to your dad if you don’t want to talk to her directly) about it to clear things up. I think airing your dirty laundry online, where she could see it (and people who knew her would see it), blew things way out of proportion." Revolutionary_Let_39