Earlier quoted context omitted.
The problem is when you write off your culpability to do more because "At least I did something" via virtue signaling. So no, it's not wrong to virtue signal necessarily, but often is seen as an empty gesture by people who don't talk/act towards the actual problems.
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…
A lot of the vitriol on the internet is destructive virtue signaling using holier than thou approaches that alienate people close to your position, this causes division, not unity, and is one of the key issues on the Left - i.e. the Left attacking itself over minutiae as the Right marches on.