Would you more upset/angered to see a woman hitting a man, or a man hitting a woman?

You're out and about, and you see a couple having a heated argument. In a fit of anger, one person slaps the other hard across the face.

What is your first, knee-jerk reaction if the hitter is the woman?
If the hitter is the man?

Please answer honestly; not how you think or believe you should answer, but according to your genuine initial feeling.
I would be more upset to see a man hit a woman.
I would be more upset to see a woman hit a man.
Both of those would upset me equally.
Neither would upset me. I would feel something else / nothing in such a scenario.
Select gender and age to cast your vote:
Would you more upset/angered to see a woman hitting a man, or a man hitting a woman?
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