You prepared. You knew the answers. You could have done the job. You did not get the call back, or you got the call back and did not get the offer, and in the space between what you brought to that room and what they chose to see, something happened that is difficult to name but that you have spent time turning over since.
The job interview is where the class filter is most legible. It is a social performance that requires fluency in a specific register—a dialect of professional presentation that includes not only vocabulary and syntax but body language, narrative form, the particular way of talking about yourself that signals you have been prepared for rooms like this one. The people who were prepared for rooms like this one by their families, their schools, their social networks, typically do not know they were prepared. They think they are simply being themselves. They are. The problem is that their self was built for this room in a way yours was not.
Law 1: position shapes perception. The interviewer occupies a position inside an institution that has a culture, a set of unwritten norms, an aesthetic of what a good candidate looks and sounds like. They are not consciously filtering for class. They are reading for fit. Fit is class with better press. The interview is an assessment of how much you resemble the people already inside the institution, which is an assessment of how much your formation resembles theirs.
The specific mechanics of the failure are worth understanding, because they are real and because they are not about your capability. You may have told a story about your background that revealed where you came from in a way that triggered unconscious downgrading. You may have used a vocabulary that sounded regional, or too direct, or too informal for the register of the institution. You may have not asked the questions that signal you already belong to the professional managerial class—questions about strategy, about growth, about the vision of the organization—because your preparation was about the job, not about performing class fluency. You may have answered honestly when honesty was not the performance required.
None of this means you were not good enough for the job. It means you were not good enough at performing the class performance required to be selected for the job. The two things are not the same.
The remedy is not simply to learn the performance—though that is a practical tool. It is to see the interview for what it is: a class-sorting mechanism operated by people who believe they are evaluating merit. Seeing it clearly does not make the next one easier. But it stops the wrong interpretations: that you are not smart enough, not good enough, not ready. You may be all of those things and still not speak the dialect. The dialect is learnable. Your not being ready is a different question.