Here's a clue, dweebs: He's not calling her a little girl out of misogyny, he's calling her that because she's Chuck U. Schumer's lackey. If she was a man and acted the same way the phrase would be "Schumer's little boy."
You are right. What’s more, it is actually a feminist comment on Paladino’s part, since women are supposed to act like women and not like little girls.