Exactly Jesus teaches us to be virtuous but actually warns us not to virtue signal:
“Beware of practicing your piety before men in order to be seen by them; for then you will have no reward from your Father who is in heaven. “Thus, when you give alms, sound no trumpet before you, as the hypocrites do in the synagogues and in the streets, that they may be praised by men. Truly, I say to you, they have their reward. But when you give alms, do not let your left hand know what your right hand is doing, so that your alms may be in secret; and your Father who sees in secret will reward you. [Matthew 6:1-4]
There's teaching virtue, and there's virtue signalling. They are separated by real principles and self-aggrandizing.
So no, virtue signalling is not a good thing. It means empty platitudes for self promotion. Do good. If you have to crow about it, you're inauthentic.
Exactly Jesus teaches us to be virtuous but actually warns us not to virtue signal: