"It is sad to see how little respect is given to these living creatures that feel pain and fear just like us."

What? You mean that our human nervous systems are also such that even if our heads are completely severed from our bodies, our arms and legs will continue to flail in something akin to the habitual motions of escape and flight?

You know nothing about slaughtering chickens.

I have friends who were literally raised on farms, who tell me what it's really like to kill a chicken. And they say you're an idiot.

A common manual technique for killing barn pigeons (a serious pest, like rats) is to grab the animal by the head and snap the body like a whip, instantly breaking the neck and often extracting the entire spinal column even. On chicken ranches, this is done towards a wall to gather all the bodies in one place when the farmer is done.

Idiot teenage BOYS may find some sick sport in stomping on the still=flailing bodies, but the neck is broken. The spinal column is severed. Pain is not even possible at that point. It's just called "muscle memory" beyond that.