Race is a mirage but one that humanity has organized itself around in very real ways. Imagining away the existence of races in a racist world is as conserving and harmful as imagining away classes in a capitalistic world.
To be antiracist is to view national and transnational ethnic groups as equal in all their differences. To be antiracist is to challenge the racist policies that plague racialized ethnic groups across the world. To be antiracist is to view the inequities between all racialized ethnic groups as a problem of policy.
When we racialize any group and then render that group's culture inferior, we are articulating cultural racism.