It's just that the abuse by women is not as often the straight forward, physical abuse which is more prevalent from men. Rather, it's a long term, manipulative, undermining, pattern of degradation which is typically geared towards transforming the actual and apparent behavior of the man into something "bad" which then makes the woman out to be the victim to others.
^^Perfect description of what I went through with my now ex-wife. Manipulative, lying, and always a victim. There was never a time in our 17 years together where she wasn't claiming to be a victim of someone else supposedly mistreating or disrespecting her.
It wasn't till after I left her that I started to really understand the extent of her evil and manipulation. Live and learn, but it was a very expensive lesson!