Not all step parents dislike their children. It is a case by case decision. All four of my kids, are what you would call step children. I always called them my kids! Two of them are still my kids, two are not! Why, one was charged with attempted Murder, I was the victim. The other one disowned me after raising her for 18 years. She found her bio-daddy, the guy that didn't care enough to be there for her. Her told to make a choice, she calls him Daddy and told I could kiss her a$$! Did you give your step parents a reason to not like you, or are they just IGMO's?
It's nature. They want to keep family resources for their children with their spouse or previous relationship. Also they may be jealous. Another thing is that stepkids make it difficult on them, also, as children are loyal to their biological parents and resent new person coming in, often.
If its a blatent dislike for the step-child without a clear reason given from the step-child (i.e. the step-child being disrespectful or troublesome to the step-parent) I can offer that its because the step-parent knows that the child is not actually theirs. Its a mental thing. But if the step-child is being a an aggressor towards the step-parent, then that would be the reason.
I know when I was young my mom chose to ditch my little sister and I to go live with my step dad and his five kids. She left us to live alone together in another city. We were 15 & 13. At first we blamed him. As we aged we both realized that she really chose a man over her kids. Her needs and wants were more important than her children's. I really think this is key. Too many parents put their own wants before the needs of their kids and kids pay the very high price. It's a disappointing and sad reality. The only good news, it's not your fault. My husband is a great step dad. Not a perfect one but one who tries. Good people make good parents, step or otherwise.
It's a 2 way street, there's countless numbers of stepparents out there who bend over backwards for their step kids and the kids treat them like crap. Why? "You're not my real dad/mom". "You took my mom away from my dad". It doesn't matter what really happens, the truth is never perceived that way.
Definitely not all step-parents are like that... I have a step-dad who I call daddy, I have a step-mum who I call mummy, however I have a step-daughter who doesn't like me.. I kinda thought that we would of had that mother/child bond, just like how I do with my step parents.. but I think it depends on the child and their biological parents.. if the biological parents teach their child respect and love for others, then that child will obviously respect and love others, but if children aren't taught important values then obviously they're not going to show it..