You are a lucky man, being the sperm deposit of black men, I always found the use of a white ass by black studs very sexy, they unload their manhood, lust and perversions as if it were to end the world.
Hello "paisano", from what I see you are Latino like me (or at least you are of Latino descent). From what I read in your post, I think you ask about the behavior of men in northern countries (US and Canada) because really very little happens here in the Caribbean (I live in Venezuela), here it is not uncommon to see black men and whites living together, including European, Cuban, Dominican, Peruvian or Ecuadorian migrants. The thing changes if they are Asian, there is no relationship with them.
I also have friends who live in Chile and Argentina, they say that there is a certain discrimination when interacting with black Caribbean migrants.
On the other hand, my friends in the United States tell me that everything depends on the city, I have friends in Texas, Florida and New York, and they have had relationships with any race without problems. What if they tell me is that white or black prefer to have their social relationships separately (not binding, there are many mixed friendships). But from my experience and what my friends tell me, the underlying theme is not ethnic, rather the social groups within bathhouses, saunas, orgies, etc., are limited to other types of things such as Muscle Men, Sissy, Mature, Young, and what is common in our countries, the social division between rich and poor, when I enter a bathhouse you can see the difference between those who have a higher social status and those who do not.