The research approach used by symbolic interactionists studying urban life that involves not imposing one's own values or views on others is often called

I believe the answer is: Chicago School of Sociology

According to Chicago School of Sociology, urban environment is created by a lot of groups of people which come in together from various backgrounds.
To get along in such culture, it is necessary for people to stop forcing each other to conform to their personal culture and start to develop a sense of tolerance.