What kind of a human being would scream at a small child, a toddler, telling the baby to "SHUT THE F**** UP!!!!"?

I’ve been going to my daughter’s apartment complex to babysit the twins while she works. I had them both down, happy and quiet / asleep, and snuck outside the door to have a smoke.
A small child, maybe 3 years old, was screaming in the apartment above and across from her apartment. The screaming went on for at least a minute, then turned into actual crying. Then I heard a man’s voice thunder “MAX!! SHUT THE F**** *UP!!!!” It just made me want to throw up.
Who could even consider saying such a thing? It makes me sick to think what his physical “punishments” consist of.