You mean being white enough and assimilating? The problem with that argument is that when white immigrants came here, they were expected to assimilate, whether they wanted to or not. My grandfather stopped calling himself "Ludwig" when he came here and started calling himself "Louis". (He also changed the way we pronounce the family name, but that has kind of stuck.)
Blacks don't really have that option.
Now, fun fact, Latin America never had the kinds of racial segregation laws that we had. So blacks, whites and natives interbred pretty freely and they have nowhere near the race problems we have.
You're not going to get an argument about racial segregation laws. I don't know anyone today that thinks they were a great idea, except maybe democrats before 1970. As for assimilating, it only makes sense that you would be more successful, have a larger market for your goods and services, etc. if you appeal to the major cultural group in your nation. And yes, black people DO have that option. Is your daughter more likely to assimilate into a majority European culture if she is named Shaniqua or Suzanne? Is Dad more likely to assimilate in an office if he wears African tribal gear or a suit? Is a family more likely to assimilate if they openly celebrate Kwanzaa or Christmas? Assimilating is merely de-emphasizing your differences and emphasizing your similarities.
Sometimes assimilation is a positive thing, like when it reduces discrimination, other times it's not, like when it makes you just another member of the herd, instead of unique.
I would also dispute your contention that racism in Latin America is not as problematic as what we've experienced. Apparently, they discriminate just as much as everyone else does.
Reconstructing Race: Racism, Culture and Mestizaje in Latin America
"One of the most puzzling, disconcerting phenomena that the non-native visitor confronts while traveling in Latin America is the relative ease with which pervasive and very visible discriminatory practices coexist with the denial of racism. Although, of late, new social movements have challenged the “normality” of this practice, it has not subsided. The usual local explanation our traveler might receive—whether in metropolitan centers like Lima, Bogotá or Santiago, or in provincial cities like Cuzco, Cali or Temuco—is that the discriminatory behavior, practiced both by the elite and the dispossessed, is not racism because it is based on cultural differences and not on skin color or any other biological marker. Race is not important in Latin America, our foreign friend would also be told; it is ethnicity that matters."
Fun fact, I lived in what was to become Belize from the age of 3 months to 4 years, and racism was not only present, but culturally enforced. The whiter, or "clearer" your skin was, the higher up the social ladder you were, and light-skinned natives and Africans participated, discriminating against darker-skinned people.