I don’t think the socioeconomic status is the issue. Where I live there are many public swimming pools in all parts of town and in neighborhoods of various economic status. I grew up with access to swimming pools, and swimming lessons starting at age 5. But, I still won’t go in water unless I can stand in it. But that’s just me personally. I think whites are just more into seafaring activities. Especially where I live in the southeast, many white families can trace their lineage to the pirate eras and the revolutionary war. If their ancestors came here sailing on a ship, I would think it would just be more natural, that they would know how to swim, sail, operate a boat, etc.