We often respond to people or situations with which we are least familiar with our most subjective evaluations, projecting our judgments onto what we think we see (or hear or feel or otherwise perceive). This kind of projection is especially risky when people from a similar background (regional, national, ethnic, generational, etc.) share their reactions and find confirmation of their agreement. The consensus is taken as validation.
This article from the International Journal of Intercultural Relations highlights the popular DIE exercise (describe, interpret, and evaluate) which offers a better way to understand different cultures and to see the world through a new lens.