My mother is arguing with me on purpose?

Hey, lately we've been arguing every morning at school and in the evening. For example, if I say I'm not hungry she gets offended straight away because she did the "extra" for me even though she wanted to and then she starts arguing that I'm ungrateful etc. Today I was at the playground with my sister and my friend and we were playing together. When we got there my mum didn't say anything and then I asked if we could go to another one because I just wanted to, and the friend was actually just my best friend and now my mum says it's my sister's too. When we were at a playground and my sister didn't want to come with us, we played together as a couple and when I got home I asked if I could go to my best friend's after dinner and she said yes, my friend wrote "can I (my name)?" My mother then said to me, "You're just excluding your sister and your girlfriend," and I was angry because she never said she wanted to come along. Now my mother is always annoying me by saying "your whore" and that we insult her like that. She calls me a fat slut and a sl@mpy bl@ch bitch. It's ANNOYING and she won't stop for a single evening… it's been three weeks now, every evening she only drinks beer. I've told her to stop, but she won't.

What can I do about it?