Okay, so this wasn’t really a big problem but it's been bugging me since it happened. A few days ago, my stepmom asked me and my sister to help her with her makeup. She just wanted to borrow some products and get some help. While using the eyeliner, she accidentally shut it in a way that made the brush tip crooked, basically ruining it.
My sister, who had bought the eyeliner a while ago, got really upset and even started crying a little. But she still stayed polite and just told my stepmom, "You accidentally shut it in the wrong way and now it's ruined" (she did say it in a polite way I just don't know how to explain it) Instead of acknowledging it, my stepmom got defensive and said, "I didn't do anything, I just used it a bit. I didn’t ruin it." That really annoyed me, but I didn’t say anything at the time.
the next day, she brought it up again, saying, "I was really sad that you (my sister) blamed me for the eyeliner. I just wanted to have fun with you guys, and you turned it into a big deal. I didn’t even do anything, and your behavior really upset me, i was surprised on how you could act like this about such an unimportant thing" She was obviously playing the victim, so I finally told her, "It was your fault. She bought a NEW eyeliner for herself and let you use it, and when you ruined it, you started lying and saying it wasn’t your fault. It’s not even a big deal. just accept it. She didn’t even chew you out. Wouldn't you be mad if i had done the same thing to your stuff?" She got quiet, and we never talked about it again. So, aitah for telling her that?