How am I wrong?

As of recently, I’ve been sleeping in my mother’s room because I’ve been very sick and sometimes I stop breathing in my sleep. This morning I caught her masturbating when she thought I was sleep. It disgusted me and so I stormed out of the room and slammed the door(wasn’t my intentions..I was just that pissed). Minutes later she comes at me and asks me what’s my deal?! So, I tell her the issue and she blows the hell up in my face about how I slammed a door in her house and that it’s so disrespectful. I counter with the fact that I slammed the door accidentally and that I was upset because of what she was doing while I was laying no more than five feet away from her. She completely ignored me and went on a rant about how wrong I am..and I’m just trying to figure out how in the actual fuck am I getting my head yelled off because she’s being fucking disgusting?!?!?! Sorry if I posted this in the wrong spot..I just thought this was the only group that seemed to fit the post because it’s about adults?!?!