Not sure if he'll substantiate the misogyny idea, but in case he doesn't, the usual argument is that sexualized images of women such as Snyder loves to put on screen--as many if not most directors do, by the way--objectifies them. When women are objectified, it tends to undermine their sense of self-worth if the person being put on-screen personifies a level of beauty that most women can't achieve. Women want to be Amy Adams, or Gal Gadot, but most just aren't born with bodies to achieve that, so to perpetuate the imagery is implicitly misogynistic.
Having said all that, Snyder just likes extremes of humanity regardless of whether it's a man or a woman, so the usual radical charges really don't work with him. He does the exact same thing with men as is evident in Cavill or Affleck's extreme size and conditioning. You might equally charge Snyder with being misandristic (hating men) by putting imagery like that shown below on screen making most men feel horribly inadequate.