There’s something to be said for that. Under U.S. law, how is a women’s sports league any different than a segregated restaurant from the Jim Crow era?
The letter of the law, or how it is practically applied?
In practice, women, like blacks, are favored classes. Blacks are allowed to self segregate in "black clubs" on campus. Similarily, women are allowed (encouraged) to have they own sports. It is even in U.S. law as "title 9" for university sports.