At what point does anti-racism become indistinguishable from racism?

A question inspired by a perceptive remark  from Ann Althouse about the fantastic lengths the press went to impose a racial narrative on the Trayvon Martin shooting:

Ironically, anti-Zimmermania featured attacks on him for (suppposedly) shooting impulsively because of race, but the attacks on him were themselves shooting impulsively because of race.

It is ironic but it would probably would be less so if we better understood that being anti-anything carries risks. We tend to be defined by the things we are focused on and if we spend a lot of time and effort focusing on what we don't like those things we don't like will start to define us.

A classic bit of advice from motorcycle training: Don't look directly at the thing you don't want to hit.