Is it normal i hate my mother because she's fucked in the head ?

My step dad is a mother fkn asshole a lot of the time. He mentally abuses mum over nothing! He was meant to be moving out for the 4th time in few years but again she felt "sorry for him" and after she met up with him after he left in a rampage being out of the house for few days, they talked and now he's back! I'm sick of it, sick if her and I no longer have any love left for my mum. I wouldn't care an ounce if she was no longer in my life. She puts him before my sis & I. She even said that, "you girls will be gone in a few years and I'll be alone". I'm very disappointed in her, she taught me spiritual views bur i no longer listen to her because she's just like the rest ! Full of shit !