I immediately recall at least two big fuckups that the "one" (two different persons) didn't acknowledge, even if that meant to lose a good client, and I would guess bad mouthing.

Once I ate a small fuckup from one of my juniors (we put a wrong software version in a report), and instead of fixing it with the client by simply saying "we had a mistake, here is the fixed report", my superior only could think about "could we hide this, and keep the face that we are perfect?". Of course, this same person takes any mistake from other people as an opportunity to ask for discounts, compensations and freebies.