I think it stems from men trying to come to terms with their own mortality. A lot of men view life as a competition - treating life as something to be conquered takes the edge off of the ever-present promise of our eventual demise. These men think if they make lots of money, buy the biggest house, and fuck the most women, they win... in that sense, the woman is "just pussy" by virtue of their intent - they don't desire the actual sex, just the prestige that in brings them; another notch in the belt, a point, a trophy.
I think some men are also just so intimidated by the totality of being with a woman and all that their time together encompasses, that they subvert their emotions and distance themselves as much as possible from them. Opening up to the actuality of the moment is a weakness to be avoided at all costs. Being male means picking up on other males' defects, to an extent, so many men will go to great lengths to keep their defense up at all times.
I have a crazy headache, sorry for meandering, but I think this more or less explains my position - men who subscribe to the "just pussy" way of thinking are more deserving of pity than hate.
