Mad I won't buy her a car

I'm 20, and saving up to buy a car. During this time, my mom has thrown ideas at me for what kind of car i might like. First it was a jeep, and now its a suburu crosstrek, because its the model she would want if she were to get a new car. (she doesnt need one, her cars in perfect shape). I thought about a suburu crosstrek, but i decided i wanted something older and more affordable, so I'm pretty set on the idea of an old forester. if i can get a good deal. When i first expressed this idea to her, She suddenly switched up saying She wanted a suburu forester for herself too.

But today, she expressed again she thinks i would like a crosstrek more. I respectfully communicated to her, like a normal person, "Thats fine if you think that, but im pretty set on a forester." She screeched at me, "IM JUST SAYING I THINK YOU WILL LIKE A DIFFERENT CAR, STOP GIVING ME ATTITUDE!!" and then she went on a whole tangent abt how rude i am, and how ill never make it into the 'real world' bc i dont listen to adults. then she went off abt some racist shit that somehow connects to me being a rude kid?

As she yelled at me for expressing an opinion oppisite to hers, I immedietly picked up that she wants me to buy a cross trek, so she wouldnt have too, and she has come up with this plan that she gets free use of my car whenever she wants, even tho she alr has her own. Ive also realised, that she only wants a new car because i would be getting one, and she feels left out oh no. Shes only had her car rn for 2 years..its just crazy to me. I wouldnt even be getting a 'new' car. Im planning on getting a 10 year old car and it will be scratched up.. I literally dont get it.