Why did my mom say this?

Earlier, I was watching the movie "The Ref" with my mom. I had just seen the part where the whole family's yelling at each other, and the dad (Lloyd, I think his name was) was trying to say something. Nobody was listening to him, so he took the fire poker and hit the Christmas tree with it, yelling "Excuse me, excuse me, excuse me, excuse me!"

Well, seeing this, I said to myself, "Hey, I feel like breaking stuff when my family fights like that, too." And I didn't think my mom could hear me. But she did, and she got mad and asked why I felt like that. I told her the truth; why would I lie about how I feel about something that bothers me? I figured she'd want to know the honest truth. I said to her, "I only feel that way if you and Daddy choose the very room I'm in to yell and scream at each other, and it gets to me to the point where I think, "I don't need this right now". Why can't you guys talk thing out in a civil way more than yelling at each other? It bothers me to the point that it makes me sick. I'm already sick and might be having a re-occurrence of Hodgkin's Disease, and the yelling is just making me feel sicker. " She said to me, "Well, I'm not going to apologize, because your father and I are married. And if you don't like our yelling, you can leave."

I apologized for telling her that, but it was the truth. I had to apologize, like, a billion times for telling her the truth. All I said was that the yelling bothered me, and I wished that she and my dad would just talk things out more instead of exploding in a huge fight like they usually do. I understand that married couples fight sometimes, and that when I get married, that will happen. But I also know that married couples TALK THINGS OUT IN A CIVIL, ADULT MANNER, NOT FIGHT RIGHT IN FRONT OF THEIR KIDS ABOUT STUPID STUFF! And what I mean by stupid stuff is stuff like my dad forgetting to pick up one bottle of soda, or a box of Cheez-Its. I'm serious.

And I would just go into another room when they fight, but my mom will sometimes yell at me for "being childish" about having to be a witness. I mean it; she'll take my not wanting to get involved in a fight that has NOTHING to do with me, or that I'm not required to be a part of, as "childish". What is so childish about not wanting to stick around and watch your parents have a screaming match with each other, and keep looking out the window to make sure the neighbors (my neighbors are nuts) didn't call the cops on them? At least my dad defends me and tells my mom to let me go into the other room. And at least, if I had told HIM that, he wouldn't have told me point-blank, "You can leave if you don't like us yelling". He really would never, in a million years, have said that.

I know my mom loves me, and she does show it, but I need to know why she said those cold words to me. She knows my condition, and she knows that even before I got sick about three or four weeks ago my health was still adversely affected by her and my dad's screaming matches at night. I know that she's worried about me and is stressed because no doctor will see me because my family got cut off our health insurance, and nobody will provide us with any insurance, but she should talk about it with my dad instead of yelling at him for forgetting to pick up one cheap bottle of soda or one cheap box of Cheez-Its. It's not like we're starving or anything; we have plenty of food and plenty of drinks (mostly juice, since it's summer) in the house, so I don't see what the big deal is.

Note: I'm always paranoid about the cops coming to our door when my parents have their fights because, of all times of the day, they have their arguments AT NIGHT, when people are ASLEEP. Plus, like I said before, most of my neighbors, except for three people, are nuts.