I'm inclined to suspect there's probably no meaningful difference between virtue-signaling and "lack-of-virtue-signaling."

On the one hand, you might have a person wearing a ribbon to signal that they reject the system of rape culture and value consent. On the other hand, you have someone wearing a MAGA hat to signal that they reject the system of political correctness and value plain talk. In either situation, someone is trying to signal both that they reject one system of virtue, and embrace some other system of virtue.