I recall seeing a Rousey fight a couple of years ago- she had already won, and was continuing to beat on her opponent. The Ref stopped it by the simple expedient of picking her up in one arm and slinging her back behind him. He wasn’t an unusually large or muscular man, either, as I recall.
I do not want to be on the receiving end of a Rousey punch, but I’d agree. I could pick her up comfortably (except that she might object), and she could not do the same to me.