iirc sudo has a bunch of quotes to spit out when an incorrect password is typed. Gentoo exposes that feature with the offensive USE flag.
Argh, why tho?
Like, I get that it is sometimes fun to throw some humor and things like that, but it is just too much trouble. It looks unprofessional and makes translation more of a pain than it needs to be. And that isn’t even opening the can of worms that insults actually are