The irony is that the inhabitants of the "San Francisco Castro neighborhood" also form an ethnic group by virtue of living in the same place. Notably, it's a gay neighborhood. Takeaway? Gangs rob stores in gay villages. Oh, and cops are racists. Moral? Let people think for themselves, you can't get away from prejudice.
> An ethnic group or ethnicity is a category of people who identify with each other based on common language, ancestral, social, cultural, or national experiences.