Eduardo brings up a good point; the anonymity of the internet is an interesting and unique aspect that can contribute to racism. Just as having a username that can indicate one’s race and consequently be attacked for it, not exposing your username can allow you to attack.
Moreover, to address the highly complex question of race being ignored because nothing can be done about… I kind of see this as a handicap (to be part of a minoritized community). So, it would be like saying, we should just ignore that he is handicapped because we cannot do anything about it. This stance does not seem natural to me. Race is an important consideration, especially in feminist movements. Though there are common struggles, race is an important factor in some of the details of certain female’s own feminist agendas. For example, the white middle-class woman does not face the same sort of discrimination as a working-class woman of color.
Return to the cyber-aspect: Will racism ever leave the internet? I think the internet is always a reflection of society, so unless racism leaves society at-large (which would be a first, large, step), I find it hard to believe that it would leave the internet.