I think the poster is kind of seen differently by different people. I think for normal people, it's just a poster about the pool rules and safety, in a humorous way just saying "be cool at the pool". For people that make a racial issue out of everything, this is more about an ink blot/document over systemic oppression lol, where black people constantly have their image tarnished.... despite 2 instances of white people being "not cool as well".