Prejudice is some king of position or opinion. It might be strong, but changeable once one get to know the unusual, as prejudice is based on generalizations. In order to remain politically correct and not offend anyone I'll use a metaphor- Let's say that you believe that all the dogs bite, one you'll get to know a nice and playful dog you might change your opinion about dogs, now that you know the unusual.
Prejudices are not in our nature but it's nurtured as part of our education or socialization processes.