No she doesn't... She says it as if there was something leading up to the event that the child interpreted as shouting...
Having worked in schools and with young people for over 20 years;
I can 100% guarantee this is not a case of a teacher randomly walking up to a pupil and shouting at them and getting in their face.
I can 100% guarantee that something led up to this event.
I can 99.9% guarantee the teacher did not shout aggressively.
I'll put money on the event being something along the lines of :
Pupil being asked to do something.
Pupil not doing the requested action.
Pupil being asked again
Pupil not doing it
Teacher moving closer to Pupil and Pupil being asked in a firmer tone.
Pupil not liking the tone and having to do requested action.
Pupil reports home "teach shouted at me".
Parents storm in demanding explanations of why their precious child was shouted at for absolutely no reason...
The reasons for the thing not happening is key here. And also determining whether shouting actually occurred.
I can tell you my child will report to you that I "they shouted at me and was mean" because I asked them to put on their shoes, and they ignored the request, so I had to turn off the TV and ask more firmly. I don't shout at children (unless of course there's actual danger/they're far away etc, but again that's not the same as aggressively shouting)
So, overall , it's best to find out what actually happened.