Why Bizarre? If the "virtues" signaled are in fact not virtues at all (mostly the opposite in fact), signaling them becomes justly negative.
Discussion
Depends on what you consider to be signaling. But in the context of social media it’s impossible to tell is the virtue is followed or only signaled
There's been a lot of good discussion of this on lesswrong, dating back a decade or more. This is a good article to start with on signaling. You could spend a while going down the rabbit hole there. It's something humans have been thinking on for a long time.
https://www.lesswrong.com/posts/vzyhBN2SZpvqER4ao/an-introduction-to-signalling-theory
"Despite the relatively recent appearance of the term "virtue signalling", the problem of questioning someone's motives for appearing virtuous is an old idea. Matthew writes 2 millennia ago, "So when you give to the needy, do not announce it with trumpets, as the hypocrites do in the synagogues and on the streets, to be honored by others. Truly I tell you, they have received their reward in full."
Why would signalling virtue if you're actually virtuous be bad? This starts to get more speculative, but it may mean they may be motivated by the benefits of appearing virtuous instead of actually being virtuous."