I Hate Guys Who Hit Women

Hitting a woman is no worse than hitting a man, just like hitting a white person is no worse than hitting a black person. There are many arguments against my stance, and all of them fail.
First, we have the Chivalry Argument, which states that you should always treat women as precious little porceline dolls no matter what, and gives no further reasoning or explanation.
Second, is the Difference in Strength argument. This argument states that, since men are typically stronger than women, it would be wrong for a man to hit a women. This argument fails because I could easily substitute "white person" for women, and "black person" for men, and it would still be a true statement. Black people are, on average, more athletic than white people, but I don't see people saying, "I hate blacks who hit whites". Another way that this argument fails, is that if you have 2 people of the same gender, both of different strength levels, there would be no outcry if the stronger person hit the weaker one, provided he/she had a good reason, but the moment you have a man hitting a women, there is an outcry.
Your proposal of killing people for a simple slap or punch is laughable, and reveals some disturbing information about your moral and mental state. The amount of pain and suffering caused by a slap or punch is nowhere near being in the same league as death. What you're saying is, if women has a gun, and is holding several people hostage, I would be in the wrong if I were to knock her out? Sorry, but I'm protecting myself and others, which is of much higher importance than some broken social standard that should have died out in the Dark Ages.

I see so many guys hit women in my high school and I get so angry at them.

What goes around comes around. Tell that to the perpetrator regardless of gender. You're an unjust man if you believe otherwise.