Why are most people from the carribean especially barbados complex about being dark skinned or mixed?

For instance. one of my close friend from Barbados always had an issue when someone mistaken him for a jamaican, haitian or african. However, he never had an issue with being called a british boy. I would expect things to be the other way around (although he is a dark to brown skin bajan guy) and wouldn't get upset at being mistaken for another culture..aren't we all black at the end of the day...why would they prefer to be clified as british guy although we know they were colonized they by Great Britain? and he also mentioned how Bajan guys prefer light skinned girls over dark-skinned ones....why is there a big prejudice issue in Barbados