>>10If your Utopian scenario of every race keeping to themselves was realistic there wouldn't even be a term like racism. Racism is exclusively referring to holding somebody back from the same opportunities that everybody else in the community has because of their race.
Not wanting to mix with other communities due to differing cultures isn't racism. But not wanting to mix with an individual who was born and raised within your community just because of how they look is racism and wrong.
If you refuse to understand that, you are helping change the definition of racism, and to transfer the negative connotations of the term to the desire to not have your community invaded by different cultures.