The working class is determined by its culture and habits. I am from the Czech republic, a country that suffered under the communist regime for 40 years. During that era, thousands of gifted people were forced to quit their jobs and among them were artists, teachers, doctors and so on. Those people had to work somewhere and they were forced to become keeping ladies and handyman or factory workers for instance. But still they kept their attitude and did never mix up with their new collegues. Most of them emigrated later on.

To be or not to be a working class member is not about income or profession. It is about your attitude.