At what age should a father start encouraging his son to "man up" by hitting him or yelling at him when he cries?

Since babies are expected to cry at birth, as that's a good sign that they are alive and well, it's okay for a male to cry when he's one second old. But at what age does it become unacceptable to the point where a father should physically and verbally tell his son to "man up" whenever he cries? show more Since babies are expected to cry at birth, as that's a good sign that they are alive and well, it's okay for a male to cry when he's one second old. But at what age does it become unacceptable to the point where a father should physically and verbally tell his son to "man up" whenever he cries?
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