The way you've described, it does sound damaging. There's using a loud voice, to command a room, and then there is demeaning remarks and intimidation of vocal cords.
My oldest struggled this school year, over this type of behavior, maybe not shrieking, but who tells a child their art isn't good enough? Wish he'd told me sooner. Certain, for him, double hard, not piecing that's a behavior he's seen in action before. ..he sort of has it right, walk away from it, however, he needed to learn to talk about it and what it means going forward.
I hope, you can sort through it, and learn coping techniques for when you get that familiar feeling.

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