Transcription
A Twitter post by Dana Schwartz @DanaSchwartzzz that reads Whenever I scold my cat, I use the royal we" so she doesn't feel so ashamed. “We don't eat that. We don't chew on electrical cords," I say. It's as if I, too, have a problem with eating wires or plastic I found on the floor and she and I are working on that problem together.
But it's not.
We, the king, say this with all authority - the "royal we" is used when one wants to say "I" but make it sound more grandiose and important.
What the woman in the OP describes is the "patronising we". Yes, it's also a nosism, but it's very much not the "royal we".