Your social class is determined by your genetics (sexual market value), fitness,

Your social class is determined by your genetics (sexual market value), fitness, habits, manners, ethics, morals, vocabulary and education.
Your economic class is determined by the value, quantity, and complexity of the responsibilities you own, hold investments in, and manage. It has less to do with your occupation, work environment, and income.
Your political class is determined by your relationships to people of influence in altering the probability of outcomes for others you do not directly interact with.
Your practical class is determined by the lowest of these three classes.