I constantly hear people on mn and in real life saying x, y, and z 'shouted' at them when I think people use this term to try to villainize somebody who either confronted them, asserted themselves, or stood their ground.
I am a teacher and the kids constantly say I or other staff do it when we reprimand a kid in a normal voice, furthermore, I hear staff do the same about managers when said manager just told off the teacher over something. I have even heard my head telling off a staff member in a calm voice and the teacher goes to the pub later and said ''he was screaming in my face'' which was beyond the truth.
Even my dh does it when I call him on something in a normal tone, rather than admit his wrongdoing, he will use the old 'why are you shouting' gaslighting to try and deflect the issue.
Shouting is NOT a telling-off or a rebuke, shouting is loud voice that would be heard from far away and would signal loss of temper. People use the word to try and play the victim.