Learning to replace “that was bad” with “it really needs work” isn’t just an exercise in politeness.
It is okay to be unfiltered. It isn’t okay to provoke shame – that is the refuge of the insecure.
Aside from extraneous situations in which we might attempt to stir emotion to inspire forward motion, framing feedback in a way that feels constructive is the effective choice – especially if we care about the long run.
It certainly is worth the effort.