Single men want to date women who don't hate men.
Some women hate men.
However, even if man haters have some legitimate basis for their hatred, most men want to date someone else. Men don't need to waste their time dating women who hate men. This is good. On the other hand, if she hates her ex, and thinks all men are the same, I don't need to waste my time. T here are some noble fools who will break their backs trying to convince a man hater that all men are not the same, but their efforts are seldom rewarded.