*If some women can go along with putting male rapists in female prisons, they could probably go along with letting males hit women in amateur boxing.
Not every crazy decision depends on hatred.*
No, just craziness. Some people justify putting men in women's prisons by saying "If you can't take the time, don't do the crime." I wouldn't be surprised if those same people justify allowing men to punch women by saying "If you don't want to get hit, don't do boxing."
Both boxing and prison are very 'unfeminine' activities, and some women have no issue with punishing other women who engage in unfemininity.