Step-Dad

Amongst all of the other general life quarrels I struggle through, there's the "daddy issue". He rants at me every day, telling me my mother is a pig and a "cunt" by the way i HATE that word with a fiery passion, and he talks about how my mom isn't a good mother because she's like my best friend and not my mom and thats why I am the way I am, and he says he's sick of her being so selfish because everything's not about him and how he's not happy because we're in his life and he's about to pack up his shit and leave.
I hate when he does this. It just makes me want to cry. I mean... Its just been my mama and me since I was a baby. I mean, sure there was grandma and grandpa involved for the first few years to help raise me, but me and my mom have stuck together thick and thin. And this father figure I have now came in when I was about 5 years old, and everything was good, until I hit about 10 or 11. It was like I could do no right at that point. We could play and laugh, but if I made one unknowingly wrong move, he would get so angry with me. If i spilled anything I became a selfish pig. Clumsiness runs in my family, but it seems to be an unforgivable thought in his eyes. I tried to make him happy, but I guess I've always known that I wouldn't be perfect, so he would never like me enough, or be nicer to me.
Then when everything happened, he seemed to hate me so much and on one occasion he even called me "whore." I told my mom, but she didn't believe me, which only made the hate in my heart sting worse because it went without vengeance.
Today was no different, I got the whole ranting schbeal again, and he made a comment as to one day I would see my mother's follies and I would hate her too and blah blah blah. And I mean... My mom has some serious flaws. We all do. Does that make her an awful person? Absolutely not. i mean, sometimes Dad makes some valid points about my mother, but he shouldn't be so critical of her, he shouldn't throw bricks at glass houses when he lives in one.
I mean... I love my mom, and no matter what I'm on her side. She may, yes, annnoy the crap out of me sometimes, but I will NEVER side with anyone else, she's my mama. She gave up a lot to take care of and have me. Why would I think badly of a woman like that?
It just hurts to think about....