Why in the world would a woman slap a man if it wasn't fueled by some emotion like anger or hurt? Are you telling me that people just go up to others and slap them with the intention of walking away and forgetting about it? Like it's a bodily function of some sorts? "I haven't slapped you yet today, please come here." Men hit women out of anger and frustration. It is directly linked to our emotions and need to protect ourselves from outside forces we feel that we cannot control. The only time this doesn't apply consistently is during sports.
If my boyfriend laughed at my friend because she fell down, I would nudge him on the shoulder as a way to say, "That wasn't funny. She could have hurt herself." It is in defense of her friend's sudden misfortune (falling down). This is tied to an emotion. She was angry because the guy was amused by someone else's misfortune. More importantly a person she cares about. Granted a full punch to the face sounds like overkill in that situation, and I think that would rarely happen in reality.
You don't sound very emotionally aware of yourself or how you come off to people.
I remember my sister, her husband, and I went out together one night. My sister and I are very close and I'm very protective of my family. We were heading to the front of the line at the House of Blues that night because we'd gotten our tickets early. It was raining and my sister was wearing a cute white shirt and was huddling next to her husband and running inside. Some douche from the line shouted, "Should've worn black, bitch!" I whipped right around and picked him out in line. I marched right up to his face and said, "What did you just say?" His eyes widened and he tried to look dumbfounded and mumbled, "Nothing." I looked directly into his eyes for 5 seconds and said, "Good. Keep it that way." I don't take kindly to people who disrespect my loved ones. My brother-in-law said the guy came up to us later on that night to apologize. I don't remember 'cause I was druuuunk :)