White men can't jump. Some blacks, particularly males, have more difficulty than most whites in water due to a difference in muscle and bone. But as a white guy can learn to jump, a black guy can learn to swim. Just takes a different approach.
OOPS! Like Jimmy the Greek, I may be about to find out the truth is the new hate speech! < /sarc >
I'm white. When I was young I was so skinny I had to run around the shower to get wet. I loved going to the muni pool and river to swim, and I was a good swimmer. But every time I tried to float, I sank like a rock. I was a sinker. I was too skinny, and my bones must have been pretty dense.
I failed a lifesaving course because I couldn't float. I saw other skinny kids who floated and wondered why I couldn't. Today I'd have no problem floating. Unfortunately.