Men and women are generally different in physiology, psychology, and many other measurable ways. I don't see why it should be puzzling that there are specific spaces or areas in society that accommodate more of one than the other. This has been demonstrated numerous[0] times[1] by[2] studies[3] (and there are plenty that go both ways, I'll readily admit, but the measurements favor sex-segregated education for certain ages of school children, for example).

It is only people pushing something about "equality" that rejects that men and women are different that take issue with this idea.

[0] https://en.wikipedia.org/wiki/Single-sex_education#cite_note... [1] https://en.wikipedia.org/wiki/Single-sex_education#cite_note... [2] https://en.wikipedia.org/wiki/Single-sex_education#cite_note... [3] https://en.wikipedia.org/wiki/Single-sex_education#cite_note...