This is not true he does kill many female enemies and even kills female "great-enemies". I do NOT blame the OP because the author does allude to this many times and even says if you were not a girl I would have killed you already. The thing is with those girls they were very minor enemies who were only there for a couple of chapters and he does destroy their cultivation at least. This is not the best outcome where they should have been killed off for trying to kill the MC, but again these are/were just the minor, here-today-gone-tomorrow, enemies (or enemies of the moment).