I agree with you up to a point. It's not a movie-breaker. It's a relatively minor point, one that just happens to attach itself to a major point. However, the point to which I disagree with you comes at the end. "I knew the joke was a mistake. It is easy to get confused by it," but, "this is not a legitimate criticism of the film. If it negatively affected your enjoyment of the film, that is your fault." So it's a mistake, it's confusing, but if it bothers someone, it's their own fault? That's something I can't get behind.