The difference is that Star Trek has always had some kind of agenda at its heart: feminist, liberal, egalitarian, whatever. If you sell your programme or film as a 'progressive vision of the future', then don't use women as sexual objects to ogle at.
Star Trek Into Darkness and Star Trek 2009 are not overtly sexist, but they certainly contain problematic gender dynamics. I don't think modern-Trek should treat one half of the population as window dressing or (God knows the old versions certainly did). It's boring, it's anachronistic, and it's letting down young boys and girls.