I wouldn't call it prejudice. The fact is that some people just rub us the wrong way. We are all different so it is just normal to have some of the differences clash. Another thing is that we can subconciously pick up little signals that our conscious mind is not aware of. Person A could have a certain habit that someone in your past had, or an inflection of voice or smell or the quirk of flaring the nose. Any little thing. If this is something that was simular to an abuser (or just someone that you didn't get along with) your subconcious will notify you by many different means, like anxiety or anger or irritation. You may not even have a clue why or what about the person bothers you. The subconcious is a funny thing.
Carrie

<font color=green>Not knowing when the dawn will come, I open every door.--Emily Dickenson