It is immature and lazy to imagine we know everything there is to know about someone before we know that someone. We don't know their stories, their histories, their real live human feelings. We don't know their favorite movies and best memories and what makes them afraid. It is unfair to take one fact, one thing they've said or we heard they said, or one thing they wrote, or someone else's experience, or a group they identify with and make a character sketch. If people did that to us, the picture would be so woefully incomplete, we wouldn't even recognize our own description.