Its true, but many will never admit it. Some cultures are just so far apart in beliefs that they literally find it impossible to work together.
Regardless even though it is true we still must take every effort to learn to live next to those of different races and cultures as a modern society.

• Is it possible that certain races of humans do not mix well, just like certain fish can't live in one aquarium
• Will certain type of aquarium fish kill other types of aquarium fish?
• How to take care of one beta fish in a small aquarium.that the aquarium will be clean.?
• What fish eats other fish waste and which can survive in freshwater with aquarium salt?
• Is it better for humans to mix races?
• Should humans be classified as different "races"?
• Why did humans evolve into different races?
• Just a question: If humans came from ADAM& EVE only, why are there so many different races?
• Are humans a "race", races - or a species?
• If different races of humans never mixed, would each race become a separate species?