What are qualities that a friend had that made you cut them off?

I’ll go first, I was living with a friend about 2 years ago and we were sharing a restroom and kitchen. We had our separate rooms and everything so we had our cleaning agreement that every week we take turns to clean the restroom, I was always on it. Fast forward a month in I guess I didn’t notice that my hair fell on the restroom floor it was like a knot mind you I have curly hair so it knots easily and I shed a lot. I didn’t leave a whole mess of hair it was literally one knot anyway she sends me a picture while I’m out with my other friend of the knot saying to pick up after myself. I was like is she serious it’s literally a piece of hair and I apologized and said that I didn’t know a piece of hair would cause such an issue and it wasn’t my intention if she thinks I’m careless. Anyway I was always walking on eggshells or was scared to even step foot in the restroom or the kitchen because she didn’t like anything and I’m not a dirty person I always pick up after myself and I’m very considerate. Anyway she was always nit picking the smallest stuff and it would drive me crazy. Like sometimes I think she would just want to complain because she had nothing better to do. I remember I was making a sandwich because we also shared a kitchen and she would complain that it smells like something is burning something in the kitchen and mind you I was making a sandwich and she knew I was there so she was just always throwing side comments to make me feel uncomfortable or other times that I would cook she would slam the door , like a damn child, and it was always when I was cooking. I got so fed up with her attitude I decided to end that friendship.