For Stepmoms?

My dad recently ped away and my stepmom was rude as hell to me(she has always been mean to me) she didnt like my mom at all since they were both pregnant for the guy at the same time...that was like 22 years ago..why does she still hold that grudge towards me...ive always been scared of her....scared of what she thought of me but i dont care anymore. She told me not to start anything with her at my dads funeral and i was like why would i do that and she said cuz your the evil stepchild...does every stepmom think that their stepchildren are evil because they came out of someone that their man once loved and cared for...i dont understand...help