I (24m) snapped at my stepmom earlier today. For the context, last month my dad, stepmom and I got new phones when we switched to a new phone service. Recently my stepmom has been on Facebook market looking at phones and has been whining and complaining ans not so subtly begging for a new phone (a Samsung galaxy 8 something I think it's a newer galaxy phone??) Her and my dad have been arguing over it for weeks. This morning I woke up to her screaming over the phone at my dad because he put his foot down and said no to buying it for her. ESPECIALLY from market place where she has been scammed THREE separate times over phones. We have no idea why she's wanting a new phone. Nothing is wrong or broken with the current one. I have to throw in that she is Bipolar (as am i) and tends to not take her medicine on occasion. I snapped at her this morning telling her that a new phone isn't necessary unless her current one is broken because we haven't had this phones for that long (literally only a month) she threw a fit about it saying that dad and I always get what we want, which is not true at all. SHE gets just about everything she wants because she'll buy it before even telling us. She did this with the two rats (with her knowing I'm terrified of rats due to a past trauma that I've been working on) and she doesn't even take care of them dad and I do. (Dad mostly because I freak out when they get to close to me) we told her no to the rats when she brought up wanting rats (she had already bought them as we found out later that day) because we already had too many pets (two cats and 3 dogs which was only supposed to be 2 dogs but she INSISTED she got a puppy too. But she does nothing to care for her puppy and gets mad when all the animals flock to me).

She then tried to guilt trip dad into buying the phone by saying she didn't tell him no to getting a PS4. I BOUGHT that for him as a birthday present. I ended up yelling at her about how she always makes stupid purchases instead of focusing on important things for the house. Like food for example. We get small meals everyday because she's such a picky eater (granted so am I but at least I don't throw a hissy fit over it and demand my dad to make me something new WHILE he's eating.).

Now this is what might make me the AH. She got in my face about how I wasn't my business what she buys. I HATE when people get in my face so in return I called her a not so nice name (can't say it on her via the rules) and she got upset about it and ran to the room. My dad said I crossed the line but he understands WHY but that I should say I'm sorry.

AITAH for snapping at her?