Because if you don't characterize women as an oppressed people in every possible instance then you're sexist. The truth is that women benefit a great deal from the general goodwill that society grants them. From legal sentencing, to taking your kids to the park, to mentorship opportunities, to simply crossing the road. The list goes on, but western society generally goes out of its way to accommodate the needs of women, particularly in areas such as the job market, where men pave the way with increased risk taking.