Virtue Signalling... this is a signal that I'm collecting subsets and context of this meaning.
Virtue Signalling over... :)

But seriously what does it mean... ?
Some attempt below.. please add yours

- showing what a virtuous person you are, instead of actually trying to fix the problem. (aesthetics?)

- the easy showing of something being good or bad but *not* actually incorporating it into one's life (hypocrisy?)
...couldn't care less about other people or never aimed to do much. Maybe doesn't know how until others do something (person needs to follow)

- showing you care about something you might not normally care about or didn't care about until something else happened (self-interest / convenience).

- group-think / social mirroring / echo chambers
(although these terms are probably in themselves a bigger term the social grouping of people talking about the same thing almost as useless as the weather)

MORE WELCOME.