Someone hitting others because of bad words said... they actually know who they're hitting right?

Whether it's a strong sibling hitting the other, a boyfriend punching his average Jane girlfriend in the arm because she said ''I'll sleep with other guys, may your mother die'', a friend smacking you because you said something bad, etc... this is the one thing in common:

They would be hesitant in hitting a police officer, Rhonda Rousey (oh would he dare hit her if she said the same thing too?), their workplace manager/superior, someone that can hurt you, etc. Even in that slip second of anger/rage, they know very well who they are hitting right?
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Personally if someone tries to punch me:
I'm getting out of the way towards the opposite direction then running, ducking or this... if it's the right hand then block it with my left arm, quickly turn around as if I were dancing, lift my right arm very high as if when a teacher tells you to raise you hand, bending down hips and knees a bit, lock and down to the ground you go. If left hand, do the same process with the right arm and left hand lifting.
Someone hitting others because of bad words said... they actually know who they're hitting right?
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