After having written a few paragraphs, I decided I needed to largely rewrite my post, which is part of why it has taken so long.
So, racism...
I'll start with providing a definition. It has become common in progressive (and I don't inherently use this term in a pejorative fashion) circles to speak of racism as necessarily systemic. But this is a highly revisionist treatment of the term; it doesn't reflect its historical or even common contemporary definition. Racism is actually fundamentally a prejudice against another race or all other races, usually accompanied with an ideology of the superiority of one's own race. Another facet in the definition of racism, is discrimination against other races that often arises from this prejudice. However, even without this discrimination, clearly such prejudices qualify the non-revisionist definition of racism. (I'll provide sources for this definition if you all don't want to take my word for it, but I can assure you have researched this aspect).
One tendency that is often labeled "racist" is racial pride. However, pride in one's race is actually not inherently racist according to the above definition. Admittedly it often goes beyond mere pride into actual racist territory, but I have encountered numerous individuals who have pride in their race for love of their heritage, and not for contempt of any other. I have pride in my race (European) but I do not wish to dominate, expel, or otherwise alienate or harm other races.
As for actual prejudice, as I indicated before, mild degrees of prejudice naturally form as a result of the cognitive processing of substantial differences between groups (this applies not only to races, but also cultures, religions, etc). This degree of racism is entirely natural and essentially unavoidable and not something I care to even speak of as "wrong" or something that I would focus at all on combating.
These mild degrees of prejudice often inspire mild forms of discrimination (preferring the company of one's own group, refusing to date persons of certain other groups, formation of stereotypes of other groups, etc). Generally I regard mild, personal racial discrimination as not particularly harmful. It can be unethical, yes. For instance, refusing to associate with someone simply because they belong to a certain racial group I would say is unethical. It is something that I would challenge something on, but it is not yet so serious a level of racism that I think there needs to be a mass social movement to combat it. The main problem with mild racial discrimination is that it can encourage and feed more serious forms of discrimination.
Sometimes, through unfortunate negative experiences of other groups, more serious prejudices form. And sometimes these more serious prejudices lead to severe discrimination (segregation, employment restriction, prohibition of interracial mixing, eugenics, etc). I do not condone or approve more severe forms of discrimination and think they must be combated as a whole as they almost always they lead to violations of basic human dignity (which is a high priority for me).
I take issue with how races have come to be defined. The attempt to transition to a post-racial mentality has caused a great deal of confusion about race, perhaps doing more harm than good. I find that the "racial science" of the late 19th century made a good deal more sense than common contemporary race-concepts. The definitions of "White", "Black", and "Asian" all seem to me fraught with error. I prefer to identify my race as European rather than "White" or "Caucasian".
There's still more I could write about this, but I feel at this point I have been fixating on this one post for too long. If you all have any particular questions about what I wrote, I will of course try to elaborate, or I to answer if there are new questions.