I want to direct everyone to an excellent article that discusses racism. It's from the Sun Magazine. The full article isn't available on the web, but the intro is an excellent standalone. Here's a direct link to the article, and a short excerpt:

By the Color of Their Skin

There are two different types of racists. First there are the overt racists: the neo-Nazis, Klansmen, and white supremacists. Then there are the ones we might consider “passive” racists. In a society like ours, where racism is so prevalent, the vast majority of us — maybe all of us — silently collaborate with systemic racism. We don’t consciously believe in racial superiority or inferiority, but we’ve become so used to the existing policies, practices, and procedures that we don’t question them. To the extent that we don’t challenge this system of racism, we are collaborating with it.

I think the second type of racist is actually more dangerous. The first type we can easily recognize, and it doesn’t take much courage to condemn them. The second type is like an invisible gas: you don’t know it’s there until you’ve been lulled unconscious by it.