my mom is a total wanna be know-it-all and bitch

we wher n the car and my dad has the most dumbest and horrible cd ive ever heard it makes my ears bleed and my mom turned the radio up and my 4-year old cousin asks "why isnt there any rock music on here?" and i laughed and my mom was like "there is rock on here R&B" and im like theres no rock on here just a waste of talent,money,and time than my mom gave me this huge talk about heavy metal she was like all that heavy metal has screaming and i was like not all of it some yes and she says no its just screaming and i was like nuh uh and shes like yeah i know i wanted to say "how would you when you dont even listen to it?" but i dndnt my question is how is she to know more about the music I listen to when shes barely finished one song?