Earlier quoted context omitted.
Where on earth do you think inner city kids are playing water polo and golf? Just because golf courses aren't that expensive to play on doesn't mean they're accessible to poor people (plus there's the cost of clubs, obviously). And water polo... even if there are public pools near you, they probably aren't dedicating space for competitive water polo.
I played water polo at my public high school and only had to buy a swimsuit?
After segregation ended, many jurisdictions defunded public pools rather than fund desegregated pools. Instead, wealthier whites used private ones. For a brief history:
https://www.utoronto.ca/news/u-t-expert-troubled-history-bla...