Me: "No, thank you"
Boss: "But then your co-worker will keep making mistakes."
Me: "If it bothers me enough, I'll speak with my coworker directly."
Boss: "But that won't work."
Me: "But I have nothing to complain about. And if I did, I'd rather be up-front and honest with people."
Boss: "Then I'm going back through all your files and find your mistakes."
Awesome. Don't you just love how moral, just, and humane corporate life is? Proud to be a fucking American.