Depends a lot on "where" the community is.

Most communities aren't based on skin color, rather mainly based on shared language, shared culture or shared religion. Hispanic communities can have people from a number of Latin American countries, like Mexico, Colombia, Bolivia, Venezuela, these can include people with white skin ('murican racism is based a lot more on xenophobia than actual skin color). Brazil has some germanic communities in the state of Santa Catarina, but you can also find people of Polish and Austrian descent there, these are all super white, as you'd expect, but not hated for being white, although the density of nazi sympathizers there is significant.

Most black communities in the Americas formed either from populations of freed slaves or from their resistance settlements, so they often didn't "share" a culture^[slave owners figured out the hard way that having too many slaves from the same region made it easier for them to organize and revolt], but shared that common background of slavery. Not only that, they were often shunned and hunted by the white society, thanks in no small part to racist propaganda. They were more or less forced to live in their own "black only" communities.

Lastly, there are small european communities in places around Africa and SE Asia, like in India and Taiwan. These communities will tend to be "white" for the same reason hispanic communities tend to be hispanic, or arabic communities tend to be arab: because the people that plan to join them often share a common background and, since they'll be strangers in someone else's land, it's better to have a group you know to help you get started.