As she was continously cursing, which is a habit she knows I hate. And in a very negative way.

So, I calmly asked her if she remembered my rule about no cursing in the apartment.

Well, she got very indignant, saying that she didn't have to stop cursing because I (apparently) don't follow her rules when I am in her apartment (which I do, for the most part, all the time) and that since she was 55 years old, she did not have to follow my rules.

I calmly explained that this was my apartment and asked if she could please respect me while she was here. She refused, and therefore I advised her if she wanted to continue cursing she would have to go home.

Well, what a huff she got in. She began pacing around and yelling, threw my apartment key I lent her, complained about how she works her butt off and had spent a whole five minutes warming up my dinner, and said she would never come back and would have my aunt pick up her stuff tomorrow.

This is a prime example of how immature my mother is and why I feel the need to have rules in my apartment that I need her to follow. She is overdramatic and mentally unstable too, and has very poor coping skills.

I am pleased with the way I handled the situation though. I remained calm the entire time, giving her choices which she could follow. In the end, it was her who chose to leave over stopping the negative cursing.

Thoughts?

ETA: I also forgot to mention that she claimed she had been told off like a little child. I don't think that I told her off like a child in any way, and I think this is more her perception of any criticism than me coming down on her in a way that makes her feel badly.