My partner and I once went as Leon and Matilda for Halloween. I finished off a quart of milk and filled it with pre-mixed negroni cocktai to sneak it into a party as part of my costume. Boy howdy, I was so drunk I was speaking in tongues at the end of the night.
I mean I hate him, but I didn’t get that from this. To me it sounded like he was suggesting that her newfound supporters know very little about her, that they are fair-weather followers or something. It’s easy to imagine that one of his yes-men showed him a clip of a rally where somebody was fumbling for her last name, and he just took that idea and magnified a single example of something into “nobody knows”, like he always does.