Earlier quoted context omitted.
It's an intellectually dishonest argument, because it actually uses someone's profession of good intentions, accepts them , and then somehow turns it against the speaker. As used on the internet, it's also useless because it always assumes the speaker doesn't actually act on their believes, and there usually is no way for them to prove their willingness to act on their believes. It also ignores that even just stating…
Reliable signals are as a rule expensive. In decrying “virtue signaling”, I think critics express “talk is cheap” not just “talk can be false.”
Saying "virtue signaling" implores the listeners to stop expressing their views.