We are so afraid of admitting our privilege that we are unable to truly break down the barriers and become inclusive. Nor have we really grappled with the interaction and overlap between different layers of discrimination and inequity - the complex relationship between race, class and gender struggles. To some degree, I think all of the above statements are true. Racism is as persistent today as it ever has been. I am a visible minority and it seems to me that many people still have racist feelings, but they are less open about it since it's so politically incorrect.
Most racism exists because of a non-willingness for conformity.
I think other minorities also practice racism against Caucasians. Everyone will learn eventually, but parents are the first and foremost teachers. Visible being the operative word, people have looked askance at anyone who doesn't look like them since time began. One can only hope this stops as soon as possible. People who've been discriminatory all their lives, when faced with affirmative action or other remedial efforts, suddenly object under the guise that this would amount to racism, sexism or any other ism, and they are the ones trying to be good.