Korean: No you dumb Yankee, it's Corea! The Japanese imperialists blah,blah,blah...Dokdo, blah...East Sea of Korea, blah...
Me: It's not "K"orea idiot, it's spelled Corea, get it straight!!
Why the spelling changed Corea to Korea in early 20th century was gaining of English language states influence such as GB,US.
Many countries such as France, Spain, Italy and Brazil never accepted "K" spelling while it is generally accepted in English speaking countries.