Mom's New Crazy Boyfriend

Hi, Well I am a sophmore in college and I am very close to my mom. My parents have been separated for 2 years and recently got divorced. My mom began a relationship with this guy a year ago and he would disrespect my mother as well as me. He would call me and my sister out our names and say that we were stuck up and selfish. I did not and do not like him. My mom ended their relationship. About 5 months ago they began their relationship up again and I still do not like him and he continues to do the same disrespectful things. I tell my mom that I don’t like him and I hate how he treats her because she deserves so much more but she says its her life and I have to live with it and if I don’t I can go with my father. Am I wrong for not liking this guy and not giving him a chance even though my foolish mother has given him 2 chances already!! I am on the borderline of tears because my mom has went through a bad divorce where my father disrespected her and now she is getting back in the same mess all I want is the best for her and she don’t see it!!! I have a bad attitude and so much anger built up to this guy that he does not come around when I am home from school. I am afraid my anger and hate for him will erupt and I will do some harm!!! Someone please give me some advice because at this point I am so lost!!! Thanks!!!