We should remember that good people are allies to bad people when they witness bad things happening but do not take action or refuse to speak up when wrongs are being committed, verbally or otherwise. A positive way to deal with racist behavior is to try and calmly talk to the person(s) or at least tell them their racist behavior will not be tolerated. If the person is threatening or violent, get police involved. Ignoring racism only lets it fester and grow and any threats or actual violence should be taken seriously.
Believing that racism is only a problem between black and white people is very erroneous and problematic. Racist behavior occurs across all skin colors and within races as well. Let's not forget that one cannot correctly assume they know a person's race simply by their skin color or even the way they are dressed. Lastly, it's been my experience in speaking to those who attempt to deny the existence of racism to be the types of people who are too self centered to have ever even given it a thought simply because it has not happened to them or someone they love or care about.
I find racism angering and sad because every human being wants and needs the same basic things and even if some people don't like one another, there is no need to put people down due to skin color.