Khan, just called "revenge is a dish best served cold" a Klingon proverb.
he left earth after the eugenics wars in 1996?
he was in stasis from then until when Kirk revived him?
then was exiled to a planet that became incredibly harsh living until Chekov found him?
come AAAHN how is he even supposed to be that aware of klingons and that forgetful of human culture