The true definition of racism is "the belief that a race is inherently superior to another, purely because of race." Examples of this would be the German Holocaust or the KKK. Lesser examples would be any individual (white, black, Asian, Hispanic, Indian, Jewish, etc.) believing they are superior to another race, solely because of their race. And the true definition of a racist is one who believes in this type of racism.
Let me say plainly that racism is wrong! And being a racist is wrong! But according to these definitions, I don't know anybody personally who believes in racism or who is a racist! Many people can say stupid stuff and hurl insults but that does not necessarily make someone a racist.
Another definition of racism is "racial prejudice or discrimination" - behaving negatively towards somebody because of their race. This type of racism is prevalent in society. Yes, I've seen "white" people do this to "black" people, but I've seen "black" people do this equally to "white" people! A black person can be equally as "racist" as a white person. The words "racism" and "racist" cannot be claimed by any one race.
There are also interracial prejudices. You know, white vs. white (not white enough) or black vs. black (not black enough). I am in a unique position, being half white and half Native American. When I was younger, I felt the most prejudice towards me when I visited the Tuscarora Reservation, because I was not Indian enough!
And another thing: Most white people aren't really "white." And most black people aren't really "black." I've seen Indian people that are darker-skinned than blacks. I know you've heard this saying, "there is only one race, the human race." That's how it should be, but because we live in an imperfect world, there will always be differences because of race. That's unfortunate... but it's the sad truth!