1. Define racism as 'noticing race'.
2. Ignore the historical impacts of real racism that continue today.
3. Ignore the power dynamics of real racism.
4. Ignore the difference between institutionalized and individual bigotry.
You see, racists reduce the term to the lowest common denominator. They do this in order to ignore the issue.
Real racism is not just thought. Real racism is the systematic oppression of a race by the majority in power. Systematic, or institutional, oppression is the heart of real racism. Without such, bigotry is meaningless on a societal level. This is why blacks (in the US, for example) cannot be racist or ascribe to racism.