I grew up in the South bro, and the whole "black people can't swim" thing was said by BLACK people in my school. It wasn't a white guy that came up with that. I didn't grow up in fucking Hollywood. I grew up in the jungle-level Southeast United States of this continent, and I can tell you, the only people that ever said that was black people. White people may say it, but they sure as fuck did not perpetuate that myth.
On that second myth, people don't jump out planes because of stupidity, they do it because they have more than one 'chute. And it's fun as fuck.