Step parents or Roomates?

Why are step parents more like room mates that rent out the apartment? You don't really know them that well and when they try to get to know you they eventually get fed up and play the "I pay the bills" or "while your living under my roof...." cards, which does nothing but increase the distance between the two of you. In the end step parents are really like the lease holding room mate that you pay rent to. You don't really like them but you try to make friends with them so they will ease up on the rent charges. They are like the rich friend you bring along to hang out with all your not rich friends because they can't make friends on their own because they are too snobby. It is also odd when they come into your relationship with your friends and try to say things they know about you that are completely off and but they seem like they know what they are talking about so you have to make them look like a fool in front of your friends and him/her be mad at you or let him/her be right and pretend to be something your not in front of your friends. All in all step parents should not try to come into a step child's life because they don't really know the child.