[bawolff]

I feel like the term virtue signaling is used in a way that almost always implies some implication of insinceerity, i.e. they are doing it for popularity/upvotes/etc and not out of moral concern. As such i agree with the other poster that it is in essence an ad hominem, although usually its not solely an ad hominem but combined with some argument that the advocacy is superficial or ineffective. (Although typically on the internet its a pretty weak argument most of the time)