Because most men don't empathise with women and don't care to ever see things from our point of view. If you ask me men like to play the victim card a lot more than women, women are too afraid to be seen as a victim because most people give women a lot of grief if they are victims.
Fact is a lot of women are victims, but if a woman is a victim, then she's bombarded with sexist comments and given practically no compassion for it. Where as if a man is a victim, or even if he isn't really a victim, just trying to get attention, then he is given sympathy and compassion by both men and women alike.
I dated a guy who I later found out is a sociopath; and one time he tried to put his hand down my bra without permission, I didn't want it, so I jerked away from him, and he started sulking, playing the victim, and even started crying because I was so horrible to not let him touch my body, and these are some instances where plenty of men think women are sexist to them and that they are victims of women and sexism, just because women now have the confidence to stand up for themselves. And men can play the victim card for this reason, and still garner sympathy from others.
But if a woman is raped, it is often attributed to her dressing provokatively and the poor guy not being able to help himself.
Sorry if I sound like I'm slandering men here, it is not my intention, there are some good men who respect women as equals. But this is what I have observed for the past 18 years of my life and I feel someone needs to speak out against it.