It comes down to how people interpret a certain word. Using the word "Streetball" isn't racist at all. Though some people might associate the term with only a certain color of people and with playing in the ghettos.
Even as a kid, myself I played streetball whether it was basketball, road hockey, touch football etc. That's what streetball is haha. When I hear the word streetball, I associate the term with unorganized sports/free-for-all. Whereas you play in a league, with coaches and training, it's more organized in terms of the way you play. Like for example, some kids on my school basketball team when it came to playing organized basketball with a team, running through plays, playing with a ref, couldn't do it. They couldn't follow a structure, call certain plays etc. Whereas when we played at recess or after school casually, with no rules, no coaching etc., some of those kids just dominated. Had nothing to do with skin color.
So when I hear the term "streetball" being used in professional sports, it's more describing a player doing his/her own things, not following the structure/play/coach instructions etc.