Women get bullied around playing against men in a way that is just not apparent when they play with women. I can’t speak for basketball too much but whenever I have played against the best girls in football the different in strength is astronomical. Someone like me who’s not great at football but always been athletic the effort to overcome that strength difference is too much. A women could have way more skill and ability than me, yet that gap is smaller than the advantage I have with strength and even speed.