First, we need to understand the difference between racism and racialism. Racialism is merely the notion that humanity can be divided into different races, each with their particular attributes. Racism takes it one step further in Bigotryville by adding that such attributes create a racial hierarchy: certain races are objectively better than others, and vice-versa.
Can we consider an innate reaction to people of other ethnicity, created by cultural and social context, to be "racism"?
You also have to consider the above-mentionned cultural and social context. Being "colorblind" is much easier in certain cultures than in some others.
If we see [note: by "see" i also mean "hear about", as this is in a social context] someone with a gun comitting a crime, we become wary of people carrying guns, consciously or not, even though a gun by itself is harmless if no one is using it. If we see a dog attacking a person, we become wary of dogs. If we see certain manners characterizing a dangerous person, we become wary of people with such manners. And if we see a black person comitting a crime or being put on trial for it, we become wary of black people.
Is this ridiculous? Yes, but it is human nature. It is extremely easy to manipulate thanks to certain aspects such as skin color making it easier to separate humans into groups, and although it is a very malleable part of the mind, we tend to be fed specific images and notions on a daily basis thanks to TV, commercials, our own community...
For most people (today anyway), this translates to developping certain ignorant notions of other human beings, consciously or not, that discriminates them (positively or negatively). For people who are in a much more tense social context, or who are simply easy to scare, or who were raised with such ideas in the first place, it can lead into "full-blown" racism - conscious hate of the other, sometimes culminating in verbal or corporeal violence.
And racism is a relatively recent notion, and such an effect does not apply only to race, unfortunately, but also to everything that ever makes a group stand out from the so-called "norm" - religion, politics, height, weight, tone of voice, smell, gender, sex, social status... It's not "everybody(?) is a racist(?)" as much as it is "everybody is xenophobic".
Xenophobia is not truly a danger, because it is a consequence and a cause that has directed a large amount of choices historically and that has helped us survive. It is embedded in the human psyche, as much as every other constant in human history. Only a very cultured, spiritual, detached state of mind can make one discard subconscious xenophobia but that's a door that's not open for most people. Even groups that pride themselves on being egalitarian have had to make a difference between "them" and "the others", denigrating "the others" in that way.
For America (for example) to get rid of its subtle "racism" against blacks (again, for example), it would need to:
1) wait a while until the era of blacks being extremely oppressed becomes just a bad memory
2) let blacks be on the same level as whites in everything
3) stop cultivating a "melting pot" ideal but rather cultivate a "common identity" ideal
Those 3 are already extremely difficult changes to just make happen. Having an egalitarian, socialist society is ridiculously hard, because such changes have to happen naturally yet nature would rather evolve in the opposite direction as cultures get bigger and pride becomes stronger, and the few times people attempted to make it happen anyway... well, let's say communism hasn't had much luck.