I don't think the person doing the hiring needs to be sexist because it's is legal and works. IMO, it's not nearly as annoying as the hyper aggressive mall sales people that tend to mind carts and keep trying to flag people down.
The 'problem' I'm referring to need not be sexism.
Either way, you can't argue that something should be done on the basis that it is legal and works. You can obviously change the laws, and there's lots of stuff that 'works' while externalizing all the damage done.